MFS COMMUNICATIONS CO INC
SC 13D, 1996-05-10
TELEPHONE COMMUNICATIONS (NO RADIOTELEPHONE)
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<PAGE>1
                       SECURITIES AND EXCHANGE COMMISSION


                             Washington, D.C. 20549


                                  SCHEDULE 13D


                    Under the Securities Exchange Act of 1934


                            UUNET TECHNOLOGIES, INC.
                                (Name of Issuer)


                         Common Stock, $.0001 par value
                         (Title of Class of Securities)


                                   918096108
                                 (CUSIP Number)

                           Terrence J. Ferguson, Esq.
              Senior Vice President, Secretary and General Counsel
                        MFS Communications Company, Inc.
                          3555 Farnam Street, 2nd Floor
                              Omaha, Nebraska 68131
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)


                                 April 29, 1996
              (Date of Event which Requires Filing this Statement)


If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  which is the subject of this  Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box [ ].

Check the following box if a fee is being paid with this statement [X].




<PAGE>2




SCHEDULE 13D

CUSIP No. 918096108

1.       NAME OF REPORTING PERSON
         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                  MFS Communications Company, Inc.

2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                       a[ ]
                                                                       b[x]
3.       SEC USE ONLY

4.       SOURCE OF FUNDS*
                  OO

5.       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
         PURSUANT TO ITEMS 2(d) OR 2(e)                                 [ ]

6.       CITIZENSHIP OR PLACE OF ORGANIZATION
                  Delaware

                           7.       SOLE VOTING POWER
                                    None

           SHARES          8.       SHARED VOTING POWER
           BENEFICIALLY             19,580,725
           OWNED BY
           REPORTING       9.       SOLE DISPOSITIVE POWER
           PERSON                   None
           WITH
                           10.      SHARED DISPOSITIVE POWER
                                    19,580,725

11.      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                  19,580,725

12.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
         CERTAIN SHARES*                                        [ ]

13.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                  60.7%

14.      TYPE OF REPORTING PERSON*
                  CO


<PAGE>3




SCHEDULE 13D

CUSIP No. 918096108

1.       NAME OF REPORTING PERSON
         S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                  MFS Global Internet Services, Inc.

2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                       a[ ]
                                                                       b[x]
3.       SEC USE ONLY

4.       SOURCE OF FUNDS*
                  OO

5.       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
         PURSUANT TO ITEMS 2(d) OR 2(e)                                 [ ]

6.       CITIZENSHIP OR PLACE OF ORGANIZATION
                  Delaware

                           7.       SOLE VOTING POWER
                                    None

           SHARES          8.       SHARED VOTING POWER
           BENEFICIALLY             19,580,725
           OWNED BY
           REPORTING       9.       SOLE DISPOSITIVE POWER
           PERSON                   None
           WITH
                           10.      SHARED DISPOSITIVE POWER
                                    19,580,725

11.      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                  19,580,725

12.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
         CERTAIN SHARES*                                        [ ]

13.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                  60.7%

14.      TYPE OF REPORTING PERSON*
                  CO


<PAGE>4




Explanatory Note:

                  As a result of executing the  Stockholder  Option,  Voting and
Proxy  Agreement  dated  as  of  April  29,  1996  (the  "Agreement")  with  the
stockholders listed on Exhibit A to the Agreement (the "UUNET Stockholders") and
MFS Global Internet Services,  Inc., a Delaware corporation ("Sub") and a wholly
owned subsidiary of MFS  Communications  Company,  Inc., a Delaware  corporation
("Parent"),  Parent and Sub may be deemed,  for the purposes of Section 13(d) of
the  Securities  Exchange  Act of 1934 (the  "Exchange  Act"),  to have formed a
"group" with the UUNET  Stockholders.  Parent and Sub understand  that the UUNET
Stockholders  will file separate  Statements on Schedule 13D with respect to the
proposed transactions.

                  The information regarding the UUNET Stockholders  contained in
this  Statement on Schedule 13D is provided to the best  knowledge of Parent and
Sub and, unless otherwise indicated,  is based on information provided to Parent
and Sub by the UUNET Stockholders.

Item 1.  Security and Issuer.

                  This  Statement  on  Schedule  13D relates to shares of Common
Stock, $.001 par value per share (the "Shares") of UUNET  Technologies,  Inc., a
Delaware  corporation  (the  "Issuer").  The address of the principal  executive
offices of the Issuer is 3060 Williams Drive, Fairfax, Virginia 22031.

Item 2.  Identity and Background.

                  (a)-(c) and (f).  This  Statement is being filed by Parent and
Sub.  Parent  is  organized  under the laws of the  State of  Delaware,  and its
principal  business address is 3555 Farnam Street,  2nd Floor,  Omaha,  Nebraska
68131.  Parent  is  engaged  in the  business  of  providing  telecommunications
services.

                  Sub is organized under the laws of the State of Delaware,  and
its principal business address is 3555 Farnam Street, 2nd Floor, Omaha, Nebraska
68131.  Sub was  organized  for the  purpose  of  consummating  the  transaction
contemplated under the Merger Agreement (as defined below).

                  The  names,  business  addresses,  principal  occupations  and
citizenship  of the directors and executive  officers of Parent are set forth in
Annex A hereto and are  incorporated  herein by reference  and the directors and
executive  officers of Sub are set forth in Annex B hereto and are  incorporated
herein by reference.

                  (d) and (e).  During the last five years,  Parent and Sub and,
to the best knowledge of Parent and Sub, the executive officers and directors of
Parent and Sub have not (i) been convicted in a criminal  proceeding  (excluding
traffic violations

<PAGE>5


                  and  similar  misdemeanors)  or (ii)  been a party  to a civil
proceeding of a judicial or administrative body of competent jurisdiction and as
a result of such  proceeding  was or is subject to a  judgment,  decree or final
order  enjoining  future  violations of, or prohibiting or mandating  activities
subject  to,  Federal or state  securities  laws or finding any  violation  with
respect to such laws.

Item 3.  Source and Amount of Funds or Other Consideration.

                  Parent  has the option  (the  "Option"),  exercisable  only in
certain  circumstances  which have not yet  occurred,  to acquire from the UUNET
Stockholders up to approximately 60.7% of the Shares outstanding as of April 26,
1996, for 1.777776 fully paid and nonassessable  shares of the common stock, par
value $.01 of Parent (the  "Parent  Common  Stock")  per share,  pursuant to the
Agreement,  a copy of which is attached as Exhibit 1 hereto, and is incorporated
herein by  reference.  Execution  and  delivery  of the  Agreement  by the UUNET
Stockholders  was a condition  to the  execution  of the  Agreement  and Plan of
Merger dated as of April 26, 1996, among Parent, Sub and the Issuer (the "Merger
Agreement"),  a copy of which is attached  as Exhibit 2 hereto and  incorporated
herein by reference.

Item 4.  Purpose of Transaction.

                  On April 29,  1996,  Parent,  Sub and the  UUNET  Stockholders
entered into the  Agreement.  Pursuant to the terms of the Agreement  each UUNET
Stockholder  granted  Parent an option (the  "Option")  to  purchase  all of the
Shares  held by such UUNET  Stockholder  on the date of  exercise  of the Option
(19,580,725  shares as of the date of the Agreement  representing  approximately
60.7% of the Shares  outstanding as of the date of the Agreement) at a per share
purchase price of (i) 1.777776 shares of Parent Common Stock, subject to certain
adjustments, and (ii) the associated rights under Parent's Rights Agreement (the
"Rights  Plan") dated  September 30, 1995 between Parent and  Continental  Stock
Transfer & Trust.  In  addition,  each UUNET  Stockholder  has agreed to vote in
favor of the  transactions  contemplated by the Merger and has agreed to appoint
Parent and Sub as its attorney and proxy for such purpose.

                  The  purpose of the  transactions  under the  Agreement  is to
enable  Parent to  consummate  the  transactions  contemplated  under the Merger
Agreement.  Pursuant to the terms of the Merger  Agreement,  Sub will merge (the
"Merger")  with  and into  the  Issuer,  and the  Issuer  will be the  surviving
corporation.

                  Pursuant to the Agreement, Parent has the right to acquire all
of the Shares  beneficially  owned by the UUNET  Stockholders  in  exchange  for
shares of Parent Common Stock and associated rights under Parent's Rights Plan.



<PAGE>6


                  Upon consummation of the Merger,  the Shares would cease to be
authorized to be quoted on the Nasdaq  National Market and would become eligible
for  termination of  registration  pursuant to Section  12(g)(4) of the Exchange
Act.

                  Except as otherwise  set forth in this Item 4, neither  Parent
nor Sub has any present  plans or  proposals  which relate to or would result in
(i) the acquisition by any person of additional securities of the Issuer, or the
disposition  of  securities  of the  Issuer;  (ii)  an  extraordinary  corporate
transaction,  such as a merger,  reorganization  or  liquidation,  involving the
Issuer or any of its subsidiaries; (iii) a sale or transfer of a material amount
of  assets  of the  Issuer or any of its  subsidiaries;  (iv) any  change in the
present Board of Directors or management of the Issuer;  (v) any material change
in the present  capitalization or dividend policy of the Issuer;  (vi) any other
material change in the Issuer's  charter,  by-laws or instruments  corresponding
thereto or other  actions  which may impede  the  acquisition  of control of the
Issuer by any person;  (viii) causing the Shares to cease to be authorized to be
quoted or the National  Market System of the National  Association of Securities
Dealers  Automated  Quotation  System;  (ix) the Shares  becoming  eligible  for
termination of registration pursuant to Section 12(g)(4) of the Exchange Act; or
(x) any action similar to any of those actions set forth in this Paragraph.

Item 5.  Interest in Securities of Issuer.

                  (a) and (b). Parent has an Option, exercisable only in certain
circumstances,  to acquire from the UUNET Stockholders up to approximately 60.7%
of the Shares  outstanding on April 26, 1996. Based upon the  representations of
the Issuer  contained  in the Merger  Agreement,  there were  32,258,139  Shares
outstanding  as of April 26,  1996.  The Option is  exercisable  for  19,580,725
Shares, or, based on such representation, approximately 60.7% of the outstanding
Shares after  taking into effect the exercise of the Option.  When and if Parent
acquires such Shares, it will have sole voting and investment power with respect
thereto.

                  Pursuant to the Agreement,  each UUNET  Stockholder has agreed
to  vote  such  UUNET  Stockholder's  Shares  at any  meeting  of  the  Issuer's
stockholders  or any  adjournment  or  postponement  thereof or  pursuant to any
consent in lieu of a meeting or otherwise in favor of the Merger  Agreement  and
against any proposal for any  recapitalization,  merger (other than the Merger),
sale of assets or other  business  combination  between the Issuer and person or
entity  (other than Parent or Sub) or any other action or  agreement  that would
result in a breach of any  covenant,  representation  or  warranty  or any other
obligation  or  agreement  of Issuer  under the Merger  Agreement or which would
result  in any  conditions  to the  Merger  Agreement  not being  fulfilled.  In
addition, each of the UUNET Stockholders have

<PAGE>7


                  agreed to appoint Parent and Sub as its attorney and proxy for
such purpose (the "Proxy").

                  Other  than the  Option  and Proxy  described  above,  neither
Parent,  Sub nor any of  their  respective  subsidiaries  beneficially  owns any
Shares.  To the best  knowledge  of Parent and Sub,  none of  Parent's  or Sub's
executive  officers and directors  beneficially  own any Shares.  Parent and Sub
disclaim beneficial  ownership of such Shares and,  notwithstanding  anything to
the contrary  contained in this Schedule 13D, and in accordance  with Rule 13d-4
promulgated  under  the Act,  the  filing  of this  Schedule  13D  shall  not be
construed as an  admission  that Parent or Sub is the  beneficial  owner of such
Shares.

                  (c) There have been no  transactions in Shares or, to the best
knowledge of Parent and Sub, by any of Parent's or Sub's executive  officers and
directors, during the past 60 days.

                  (d) To the  knowledge  of Parent and Sub, the right to receive
dividends with respect to the Shares to which this Schedule 13D relates, and the
power to direct the receipt of dividends  from,  or the proceeds of the sale of,
such  Shares  held by each of the  UUNET  Stockholders  are  held by such  UUNET
Stockholder as reflected on Exhibit A to the Agreement.

                  (e)  Not applicable.

Item 6.  Contracts, Arrangements, Understandings or Relationships with Respect
to Securities of the Issuer.

                  Other than the Merger Agreement  described in response to Item
4 (which  response  is  incorporated  herein  by  reference)  and the  Agreement
described  in  response  to Item 3 (which  response  is  incorporated  herein by
reference) and the transactions  contemplated  thereby,  there are no contracts,
arrangements,  understandings  or  relationships  between  Parent or Sub and any
other person, or, to the best knowledge of Parent and Sub, among any of Parent's
or Sub's  executive  officers and  directors or between any of Parent's or Sub's
executive  officers  and  directors  and any other  person,  with respect to the
Shares.

Item 7.  Material to Be Filed as Exhibits.

Exhibit 1                  Stockholder Option, Voting and Proxy Agreement dated
                           as of April 29, 1996

Exhibit 2                  Agreement and Plan of Merger dated as of April 29,
                           1996

Exhibit 3                  Joint Filing Agreement dated as of May 9, 1996


<PAGE>8




                                    SIGNATURE

                  After  reasonable  inquiry and to the best of my knowledge and
belief,  I certify  that the  information  set forth in this  statement is true,
complete and correct.



Dated:   May 9, 1996                MFS Communications Company, Inc.

                                    By:        /s/ James Q. Crowe
                                             James Q. Crowe
                                             Chairman of the Board and
                                             Chief Executive Officer


                                    MFS Global Internet Services, Inc.

                                    By:        /s/ Albert L. Fenn, Jr.
                                             Albert L. Fenn, Jr.
                                             President


<PAGE>9




                                     ANNEX A

                             IDENTITY AND BACKGROUND

                  Listed   below  are  the  names,   addresses   and   principal
occupations  of the  directors  and  executive  officers  of MFS  Communications
Company, Inc. Each of the persons listed below is a United States citizen.

 1. Directors
<TABLE>
<S>                          <C>                            <C>
 Name                        Address                        Principal Occupation

 James Q. Crowe              3555 Farnam Street             Chairman of the Board and Chief,
                             Suite 200                      Executive Officer, MFS
                             Omaha, Nebraska 68131          Communications Company, Inc.

 Royce J. Holland            3555 Farnam Street             President and Chief Operating
                             Suite 200                      Officer, MFS Communications Company,
                             Omaha, Nebraska 68131          Inc.

 R. Douglas Bradbury         3555 Farnam Street             Executive Vice President and Chief
                             Suite 200                      Financial Officer, MFS
                             Omaha, Nebraska 68131          Communications Company, Inc.

 Howard Gimbel               3555 Farnam Street             Partner, B.G. Management Co.;
                             Suite 200                      President,
                             Omaha, Nebraska 68131          Health Consultants, Inc.

 William Grewcock            3555 Farnam Street             Vice Chairman and Director,
                             Suite 200                      Peter Kiewit Sons', Inc.
                             Omaha, Nebraska 68131

 Richard R. Jaros            3555 Farnam Street             Executive Vice President, Chief
                             Suite 200                      Financial Officer and Director,
                             Omaha, Nebraska 68131          Peter Kiewit Sons', Inc.

 Robert E. Julian            3555 Farnam Street             Director,
                             Suite 200                      Peter Kiewit Sons', Inc.
                             Omaha, Nebraska 68131

 David C. McCourt            3555 Farnam Street             Chairman of the Board and Chief
                             Suite 200                      Executive Officer, C-TEC Corporation
                             Omaha, Nebraska 68131


<PAGE>10



 Ronald W. Roskens           3555 Farnam Street             President,
                             Suite 200                      Global Connections, Inc.
                             Omaha, Nebraska 68131

 Walter Scott, Jr.           3555 Farnam Street             Chairman of the Board and President,
                             Suite 200                      Peter Kiewit Sons', Inc.
                             Omaha, Nebraska 68131

 Kenneth E. Stinson          3555 Farnam Street             Executive Vice President and
                             Suite 200                      Director,
                             Omaha, Nebraska 68131          Peter Kiewit Sons', Inc.

 Michael B. Yanney           3555 Farnam Street             Chairman and Chief Executive
                             Suite 200                      Officer, America First Companies
                             Omaha, Nebraska 68131


 2. Executive Officers

 Name                        Address                        Principal Occupation

 James Q. Crowe              3555 Farnam Street             Chairman of the Board and Chief
                             Suite 200                      Executive Officer, MFS
                             Omaha, Nebraska 68131          Communications Company, Inc.

 Royce J. Holland            3555 Farnam Street             President and Chief Operating
                             Suite 200                      Officer, MFS Communications Company,
                             Omaha, Nebraska 68131          Inc.

 R. Douglas Bradbury         3555 Farnam Street             Executive Vice President and Chief
                             Suite 200                      Financial Officer, MFS
                             Omaha, Nebraska 68131          Communications Company, Inc.

 Terrence J. Ferguson        3555 Farnam Street             Senior Vice President and General
                             Suite 200                      Counsel,
                             Omaha, Nebraska 68131          MFS Communications Company, Inc.


<PAGE>11



 Ronald R. Beaumont          3555 Farnam Street             Executive Vice President,
                             Suite 200                      MFS Communications Company, Inc.;
                             Omaha, Nebraska 68131          Chief Executive Officer,
                                                            MFS Telecom Companies
 Albert L. Fenn, Jr.         3555 Farnam Street             Senior Vice President
                             Suite 200                      Corporate Development,
                             Omaha, Nebraska 68131          MFS Communications
                                                            Company, Inc.
 Michael R. Frank            3555 Farnam Street             Senior Vice President
                             Suite 200                      Human Resources,
                             Omaha, Nebraska 68131          MFS Communications
                                                            Company, Inc.
 Philip D. Hamlin            3555 Farnam Street             Senior Vice President
                             Suite 200                      and Chief Technical Officer,
                             Omaha, Nebraska 68131          MFS Communications
                                                            Company, Inc.
 Joseph M. Howell, III       3555 Farnam Street             Senior Vice President
                             Suite 200                      Corporate Marketing,
                             Omaha, Nebraska 68131          MFS Communications
                                                            Company, Inc.
 Steve Johnson               3555 Farnam Street             Senior Vice President
                             Suite 200                      Chief Information Officer,
                             Omaha, Nebraska 68131          MFS Communications
                                                            Company, Inc.
 Andrew D. Lipman            3555 Farnam Street             Senior Vice President
                             Suite 200                      Legal and Regulatory Affairs,
                             Omaha, Nebraska 68131          MFS Communications
                                                            Company, Inc.
 Robert J. Ludvik            3555 Farnam Street             Vice President and Controller,
                             Suite 200                      MFS Communications
                             Omaha, Nebraska 68131          Company, Inc.


<PAGE>12



 Kevin P. Moersch            3555 Farnam Street             Senior Vice President,
                             Suite 200                      MFS Communications Company, Inc.;
                             Omaha, Nebraska 68131          President and Chief Executive
                                                            Officer,
                                                            MFS Network Technologies, Inc.
 Abraham Morris              3555 Farnam Street             Senior Vice President
                             Suite 200                      Operations Support,
                             Omaha, Nebraska 68131          MFS Communications Company, Inc.

 Kevin J. O'Hara             3555 Farnam Street             Executive Vice President,
                             Suite 200                      MFS Communications Company, Inc.;
                             Omaha, Nebraska 68131          President and Chief Executive
                                                            Officer,
                                                            MFS Global Network Services
 Sunit Patel                 3555 Farnam Street             Vice President and Treasurer,
                             Suite 200                      MFS Communications Company, Inc.
                             Omaha, Nebraska 68131

 Kirby G. Pickle             3555 Farnam Street             Executive Vice President,
                             Suite 200                      MFS Communications Company, Inc.;
                             Omaha, Nebraska 68131          Chief Executive Officer,
                                                            MFS Intelenet Companies
 Frederick W. Weidinger      3555 Farnam Street             Vice President
                             Suite 200                      Mergers and Acquisitions,
                             Omaha, Nebraska 68131          MFS Communications Company, Inc.

 Colin V.K. Williams         3555 Farnam Street             Executive Vice President,
                             Suite 200                      MFS Communications Company, Inc.;
                             Omaha, Nebraska 68131          President and Chief Executive
                                                            Officer,
                                                            MFS International, Inc.
</TABLE>




<PAGE>13




                                     ANNEX B

                             IDENTITY AND BACKGROUND

                  Listed   below  are  the  names,   addresses   and   principal
occupations  of the  directors  and  executive  officers of MFS Global  Internet
Services, Inc. Each of the persons listed below is a United States citizen.

 1. Directors
 <TABLE>
 <S>                                    <C>                                     <C>
 Name                                   Address                                 Principal Occupation

 James Q. Crowe                         3555 Farnam Street                      Chairman of the Board and Chief
                                        Suite 200                               Executive Officer, MFS
                                        Omaha, Nebraska 68131                   Communications Company, Inc.

 R. Douglas Bradbury                    3555 Farnam Street                      Vice President and Treasurer, MFS
                                        Suite 200                               Global Internet Services, Inc.
                                        Omaha, Nebraska 68131

 Terrence J. Ferguson                   3555 Farnam Street                      Vice President and Secretary, MFS
                                        Suite 200                               Global Internet Services, Inc.
                                        Omaha, Nebraska 68131


 2. Executive Officers

 Name                                   Address                                 Principal Occupation

 Albert L. Fenn, Jr.                    3555 Farnam Street                      President, MFS Global Internet
                                        Suite 200                               Services, Inc.
                                        Omaha, Nebraska 68131

 R. Douglas Bradbury                    3555 Farnam Street                      Vice President and Treasurer, MFS
                                        Suite 200                               Global Internet Services, Inc.
                                        Omaha, Nebraska 68131

 Terrence J. Ferguson                   3555 Farnam Street                      Vice President and Secretary, MFS
                                        Suite 200                               Global Internet Services, Inc.
                                        Omaha, Nebraska 68131


</TABLE>



<PAGE>14




                                  EXHIBIT INDEX


Exhibit 1    Stockholder Option, Voting and Proxy Agreement dated April 29, 1996

Exhibit 2    Agreement and Plan of Merger dated April 29, 1996

Exhibit 3    Joint Filing Agreement dated as of May 9, 1996




<PAGE>1




                 STOCKHOLDER OPTION, VOTING AND PROXY AGREEMENT

                           DATED AS OF APRIL 29, 1996

                                      AMONG

                         MFS COMMUNICATIONS COMPANY, INC

                       MFS GLOBAL INTERNET SERVICES, INC.

                        AND EACH OTHER PERSON AND ENTITY

                      LISTED ON THE SIGNATURE PAGES HEREOF.



<PAGE>2





                  STOCKHOLDER  OPTION,  VOTING AND PROXY AGREEMENT,  dated as of
April 29, 1996, (this  "Agreement") among MFS  COMMUNICATIONS  COMPANY,  INC., a
Delaware corporation ("Parent"),  MFS GLOBAL INTERNET SERVICES, INC., a Delaware
corporation  and a wholly owned  subsidiary  of Parent  ("Sub"),  and each other
person and entity listed on the signature pages hereof (each, a "Stockholder").


                  WHEREAS,  as of the  date  hereof,  each  Stockholder  owns of
record the  number of shares of common  stock,  $0.001  par value  (the  "Common
Stock"),  of UUNET Technologies,  Inc., a Delaware  corporation (the "Company"),
set forth opposite such Stockholder's name on Exhibit A hereto (all such shares,
together  with all shares of Common  Stock of the  Company  which are  hereafter
acquired by the Stockholders, being referred to herein as the "Shares");

                  WHEREAS,  Parent,  Sub and the Company  have  entered  into an
Agreement  and  Plan  of  Merger  dated  as of  the  date  hereof  (the  "Merger
Agreement";  capitalized  terms used but not otherwise defined in this Agreement
have the  meanings  assigned  to such  terms  in the  Merger  Agreement),  which
provides,  upon the terms and subject to the conditions  set forth therein,  for
the merger of Sub with and into the Company (the "Merger"); and

                  WHEREAS,  as a condition to the  willingness of Parent and Sub
to enter into the Merger  Agreement and in furtherance of the acquisition of the
Company by Parent, Parent and Sub have required that the Stockholders agree, and
in order to induce  Parent  and Sub to enter  into the  Merger  Agreement,  each
Stockholder has agreed, severally and not jointly, to enter into this Agreement.

                  NOW, THEREFORE, in consideration of the foregoing premises and
agreements contained herein, the parties hereto agree as follows:

                                   Article I.

                   GRANT OF OPTION AND EXERCISE; TRANSFER AND
                                VOTING OF SHARES

                  Section  1.1.  Grant  of  Option.  Subject  to the  terms  and
conditions  set  forth  herein,  each  Stockholder  hereby  grants  to Parent an
irrevocable option (the "Option") to purchase all such Stockholder's Shares held
on the date of Option exercise for 1.777776 fully paid and nonassessable  shares
of Parent  Common Stock (as adjusted in the  circumstances  described in Section
3.1(c) of the Merger  Agreement) per Share,  together with the associated rights
under Parent's Rights Agreement ("Parent Rights Plan") dated as of September 30,
1995  between  Parent and  Continental  Stock  Transfer & Trust  (together,  the
"Purchase Price").

<PAGE>3






                  Section  1.2.  Exercise  of Option.  Parent may  exercise  the
Option,  in  whole  with  respect  to  all  of  the  Shares  held  by all of the
Stockholders  covered  hereby  but  not in  part,  at  any  time  following  the
occurrence of a Purchase  Event (as defined in the Merger  Agreement);  provided
that, except as provided in the last sentence of this Section 1.2(a), the Option
shall terminate and be of no further force and effect upon the earliest to occur
of (i) the Effective  Date,  (ii) 20 Business Days after the  termination of the
Merger  Agreement  other than by reason of an event  described in clause (iv) or
(v) below, (iii) [INTENTIONALLY  OMITTED],  (iv) exercise of the Company's right
to terminate  the Merger  Agreement  because of a breach by Parent or Sub of any
covenant or  agreement  set forth in the Merger  Agreement or the failure of any
representation  or warranty of the Parent or Sub under  Article IV of the Merger
Agreement or of the Parent under Article III of this Agreement to have been true
in all  material  respects  when made or the  failure of the  holders of capital
stock of Parent to  approve  the Merger at the  Parent  Meeting,  (v) the Merger
Agreement has been  terminated  pursuant to Section 10.1(a) or (b) of the Merger
Agreement,  or (vi) the failure of the Closing (defined in Section 1.3 below) to
occur within 30 Business  Days of the Notice Date (defined in Section 1.3 below)
unless (A) the reason for such failure  relates to the  inability to satisfy the
conditions  to register  the shares of Parent  Common Stock set forth in Section
1.9 of this Agreement or for the  notification  period under the HSR Act to have
expired,  in either case, for reasons outside of the control of Parent,  and (B)
Parent  is  diligently  pursuing  the  registration  of  such  shares  with  the
Commission or promptly providing all necessary  information to the Federal Trade
Commission and the Antitrust Division of the Department of Justice,  as the case
may be.  Notwithstanding the termination of the Option, Parent shall be entitled
to purchase the Shares in  accordance  with the terms hereof if it has exercised
the Option prior to the termination  date,  unless clause (iv) or (vi) above has
been  triggered  in  which  case  the  rights  to  exercise  this  Option  shall
immediately cease.

                  Section  1.3.  Closing  Date.  In the event  Parent  wishes to
exercise the Option,  which may be exercised in whole with respect to all of the
Shares of all of the Stockholders  covered hereby but not in part, it shall send
to each Stockholder a written notice (the date of which being herein referred to
as the "Notice Date") specifying a place and date not earlier than five business
days nor later than 10  Business  Days from the Notice  Date for the  closing of
such purchase (the "Closing Date"); provided that if the closing of the purchase
and sale pursuant to the Option (the "Closing")  cannot be consummated by reason
of any applicable judgment, decree, order, law or regulation, the period of time
that  otherwise  would run pursuant to this sentence  shall run instead from the
date on which such  restriction on consummation  has expired or been terminated;
and, provided

<PAGE>4


                  further  that,  without  limiting  the  foregoing,   if  prior
notification  to  or  approval  of  any  regulatory  authority  is  required  in
connection with such purchase,  Parent and, if applicable,  a Stockholder  shall
promptly  file the  required  notice  or  application  for  approval  and  shall
expeditiously process the same (and such Stockholder shall cooperate with Parent
in the filing of any such notice or  application  and the  obtaining of any such
approval),  and the period of time that  otherwise  would run  pursuant  to this
sentence  shall run instead from the date on which,  as the case may be, (i) any
required  notification  period  has  expired  or been  terminated  or (ii)  such
approval has been obtained,  and in either event,  any requisite  waiting period
has passed. Parent agrees that it shall include the issuance of shares of Parent
Common Stock under this Agreement in the  notifications  under the HSR Act filed
pursuant to Section 8.6 of the Merger Agreement.

                  Section 1.4.  Payment and Delivery of Certificates.

                  (a) On the  Closing  Date,  (i)  Parent  will  deliver  to the
         Stockholders  the  Purchase  Price  and a  certificate  signed  by  the
         President  or Chief  Executive  Officer  of Parent to the  effect  that
         Parent and the Sub have complied with all covenants and  agreements set
         forth  in  the  Merger  Agreement  and  that  all  representations  and
         warranties  of the  Parent  and  Sub  under  Article  IV of the  Merger
         Agreement  and of the Parent under Article III of this  Agreement  were
         true in all  material  respects  when made,  and (ii) the  Stockholders
         shall deliver to Parent  certificates  representing  the Shares sold by
         the  Stockholders  to Parent at the Closing,  duly endorsed in blank or
         accompanied by stock powers duly executed by the Stockholders in blank,
         in proper form for transfer.

                  (b) No certificates or scrip  representing less than one share
         of Parent Common Stock shall be issued upon the exercise of the Option.
         In lieu of any  such  fractional  share,  each  Stockholder  who  would
         otherwise  have been entitled to a fraction of a share of Parent Common
         Stock upon  exercise of the Option  shall be paid at the  Closing  cash
         (without interest) in an amount equal to such Stockholder's  fractional
         part of a share of Parent Common Stock  multiplied by the last reported
         sale price of Parent Common Stock,  as reported on the Nasdaq  National
         Market, on the Closing Date.

                  Section 1.5.  Legends.

                  (a) Each Stockholder  shall instruct the Company to cause each
         certificate of any  Stockholder  evidencing the Shares to bear a legend
         in the following form:

                  THE SHARES REPRESENTED BY THIS CERTIFICATE MAY NOT BE SOLD,
                  EXCHANGED OR OTHERWISE TRANSFERRED OR DISPOSED OF EXCEPT IN
                  COMPLIANCE WITH THE TERMS

<PAGE>5


                  AND  CONDITIONS OF THE  STOCKHOLDER  OPTION,  VOTING AND PROXY
                  AGREEMENT  DATED AS OF APRIL 29,  1996,  AS IT MAY BE AMENDED,
                  AMONG MFS  COMMUNICATIONS  COMPANY,  INC., MFS GLOBAL INTERNET
                  SERVICES,  INC. AND THE REGISTERED HOLDER OF THIS CERTIFICATE,
                  A COPY OF WHICH IS ON FILE AT THE PRINCIPAL  EXECUTIVE OFFICES
                  OF THE ISSUER.

                  (b) In the event that the Shares  shall cease to be subject to
         the  restrictions on transfer set forth in this Agreement,  the Company
         shall,  upon the written request of the holder  thereof,  issue to such
         holder a new  certificate  evidencing  such  Shares  without the legend
         required by Section 1.5(a).

                  Section 1.6. Voting Agreement.  Each Stockholder hereby agrees
that from the date  hereof to the  earlier  to occur of the  termination  of the
Merger  Agreement or the Effective  Date, at any meeting of the  stockholders of
the Company, however called, and in any action by consent of the stockholders of
the Company, such Stockholder shall vote the Shares; (A) in favor of the Merger,
the  Merger  Agreement  (as  amended  from  time to time)  and the  transactions
contemplated  by the Merger  Agreement  and (B)  against  any  proposal  for any
recapitalization,  merger  (other  than the  Merger),  sale of  assets  or other
business  combination  between the Company and any person or entity  (other than
Parent or Sub) or any other action or agreement that would result in a breach of
any covenant, representation or warranty or any other obligation or agreement of
the  Company  under the Merger  Agreement  or which  would  result in any of the
conditions to the Merger Agreement not being fulfilled.

                  Section  1.7.  No  Disposition  or  Encumbrance  of Shares and
Options.  Except to the extent set forth in Exhibit A, each  Stockholder  hereby
covenants and agrees that, from the date hereof to the termination of the rights
of Parent under Sections 1.2, 1.6 and 1.8 of this  Agreement,  it shall not, and
shall not offer or agree to, sell,  transfer,  tender,  assign,  hypothecate  or
otherwise  dispose  of,  or  create  or  permit  to exist  any  Encumbrance  (as
hereinafter  defined) on the Shares owned by such  Stockholder at any time prior
to the Effective Date.

                  Section 1.8.  Voting of Shares; Further Assurances.

                  (a) Each Stockholder,  by this Agreement,  with respect to its
         Shares,  does hereby  constitute  and  appoint  Sub and Parent,  or any
         nominee of Sub and Parent,  with full power of  substitution,  from the
         date  hereof to the earlier to occur of the  termination  of the Merger
         Agreement or the Effective  Date,  as its true and lawful  attorney and
         proxy (its "Proxy"), for and in its name, place and stead, to vote each
         of such  Shares as its Proxy,  at every  annual,  special or  adjourned
         meeting of the stockholders of the Company,

<PAGE>6


                  including the right to sign its name (as  stockholder)  to any
         consent, certificate or other document relating to the Company that the
         law of the State of Delaware may permit or require:

                           (i)  in favor of the Merger, the Merger Agreement
                  (as amended from time to time) and the transactions
                  contemplated by the Merger Agreement; and

                           (ii) against any  proposal for any  recapitalization,
                  merger  (other  than  the  Merger),  sale of  assets  or other
                  business  combination  between  the  Company and any person or
                  entity  (other  than  Parent  or Sub) or any  other  action or
                  agreement  that  would  result  in a breach  of any  covenant,
                  representation   or  warranty  or  any  other   obligation  or
                  agreement of the Company  under the Merger  Agreement or which
                  could result in any of the conditions to the Merger  Agreement
                  not being fulfilled.

         THIS POWER OF ATTORNEY IS IRREVOCABLE,  IS GRANTED IN  CONSIDERATION OF
         PARENT AND SUB ENTERING  INTO THE MERGER  AGREEMENT AND IS COUPLED WITH
         AN INTEREST  SUFFICIENT IN LAW TO SUPPORT AN  IRREVOCABLE  POWER.  This
         appointment  shall revoke all prior attorneys and proxies  appointed by
         any  Stockholder  at  any  time  with  respect  to  the  Shares  and no
         subsequent  attorneys or proxies will be appointed by such Stockholder,
         or  be  effective,  with  respect  thereto  during  the  term  of  this
         Agreement.

                  (b) Each  Stockholder  shall  perform  such  further  acts and
         execute such further  documents and  instruments  as may  reasonably be
         required  to vest in Sub and  Parent  the  power to carry  out and give
         effect to the provisions of this Agreement.

                  Section 1.9.  Registration.  Notwithstanding  anything in this
Agreement to the contrary,  the obligation of the Stockholders to transfer their
Shares to Parent at the Closing shall be conditioned upon the issuance of Parent
Common Stock to the Stockholders being registered pursuant to the Securities Act
at the Closing.  Parent shall  include such  issuance of shares of Parent Common
Stock in the  Registration  Statement  on Form S-4 being  filed  pursuant to the
Merger Agreement.

                                   Article II.

               REPRESENTATIONS AND WARRANTIES OF THE STOCKHOLDERS

                  Each Stockholder, severally and not jointly, hereby
represents and warrants to Parent as follows:

                  Section 2.1.  Due Organization, Authorization, etc.  Such
Stockholder (if it is a corporation, partnership or other

<PAGE>7


                  legal entity) is duly organized,  validly existing and in good
standing  under  the  laws  of  the   jurisdiction  of  its   incorporation   or
organization.  Such Stockholder has all requisite power (corporate or otherwise)
to execute and deliver this Agreement, to grant the Option and to consummate the
transactions  contemplated hereby. The execution and delivery of this Agreement,
the appointment of Parent and Sub as such  Stockholder's  Proxy, the granting of
the Option and the  consummation of the  transactions  contemplated  hereby have
been duly  authorized  by all necessary  action  (corporate or otherwise) on the
part of such Stockholder. This Agreement has been duly executed and delivered by
or on behalf of such Stockholder and, assuming its due authorization,  execution
and delivery by Parent,  constitutes  a legal,  valid and binding  obligation of
such  Stockholder,  enforceable  against such Stockholder in accordance with its
terms.

                  Section 2.2.  No Conflicts, Required Filings and Consents.

                  (a)  Except as  disclosed  on  Exhibit  A, the  execution  and
         delivery  of  this  Agreement  by  such  Stockholder  do  not,  and the
         performance  of  this  Agreement  by such  Stockholder  will  not,  (i)
         conflict with or violate the Certificate of Incorporation by By-Laws or
         other similar organizational documents of such Stockholder (in the case
         of a  Stockholder  that is a  corporation,  partnership  or other legal
         entity),  (ii)  conflict with or violate any statute,  law,  ordinance,
         rule,  regulation,   order,  decree  or  judgment  applicable  to  such
         Stockholder  or by  which  it or any  of its  properties  is  bound  or
         affected,  or (iii)  result in any  breach of or  constitute  a default
         (with notice or lapse of time,  or both)  under,  or give to others any
         rights of termination,  amendment,  acceleration or cancellation of, or
         result in the creation of a lien or  encumbrance on any of the property
         or assets of such Stockholder or (if such Stockholder is a corporation,
         partnership or other legal entity) any of its subsidiaries,  including,
         without  limitation,  the Shares,  pursuant to, any  indenture or other
         loan document provision or other contract,  license,  franchise, permit
         or other  instrument or obligation to which such Stockholder is a party
         or by  which  such  Stockholder  or any of its  properties  is bound or
         affected,  except,  in the case of clauses (ii) and (iii), for any such
         breaches, defaults or other occurrences that would not prevent or delay
         the  performance  by such  Stockholder  of its  obligations  under this
         Agreement.

                  (b) The  execution  and  delivery  of this  Agreement  by such
         Stockholder  do not,  and the  performance  of this  agreement  by such
         Stockholder will not, require any consent,  approval,  authorization or
         permit  of, or filing  with or  notification  to, any  governmental  or
         regulatory authority,  domestic or foreign, except where the failure to
         obtain such consents, approvals, authorizations or permits, or to make

<PAGE>8


                  such filings or notifications,  would not prevent or delay the
         performance by the Stockholder of its obligations under this Agreement.

                  Section 2.3. Title to Shares.  Such  Stockholder  has, and the
transfer  by the  Stockholder  of the  Shares  hereunder  will  pass,  good  and
marketable title to the Shares listed on Exhibit A hereto, free and clear of any
pledge, lien, security interest, mortgage, charge, claim, equity, option, proxy,
voting restriction,  right of first refusal, limitation on disposition,  adverse
claim of ownership or use or encumbrance of any kind ("Encumbrances"), except to
the extent  disclosed  on Exhibit A and for Shares  sold prior to the Closing as
permitted under Section 1.7.

                  Section 2.4.  No Brokers.  Except for Goldman, Sachs & Co. or
as set forth in the Company Disclosure Letter, no broker, finder or investment
banker is entitled to any brokerage, finder's or other fee or commission in
connection with the transactions contemplated by this Agreement based upon
arrangements made by or on behalf of such Stockholder.

                                  Article III.

                    REPRESENTATIONS AND WARRANTIES OF PARENT

                  Parent represents and warrants to each Stockholder as
follows:

                  Section  3.1  Organization  and  Qualification.  Parent  is  a
corporation duly organized, validly existing and in good standing under the laws
of the State of Delaware and has the corporate power to carry on its business as
it is now being conducted or currently proposed to be conducted.  Parent is duly
qualified as a foreign corporation to do business,  and is in good standing,  in
each  jurisdiction  where the  character of its  properties  owned or held under
lease or the nature of its activities make such qualification necessary,  except
where the failure to be so qualified will not, individually or in the aggregate,
have a material adverse effect on the business,  properties,  assets,  condition
(financial  or   otherwise),   liabilities  or  operations  of  Parent  and  its
subsidiaries taken as a whole (a "Parent Material Adverse Effect"). Complete and
correct  copies as of the date hereof of the  Certificate of  Incorporation  and
By-laws of Parent have been  delivered  to the  Company as part of a  disclosure
letter  delivered  by  Parent  to the  Company  on or  prior to the date of this
Agreement pursuant to the Merger Agreement (the "Parent Disclosure Letter").

                  Section 3.2       Capitalization.   The authorized capital
stock of Parent consists of 400,000,000 shares of Parent Common Stock, and
25,000,000 shares of preferred stock, $.01 par value.  As of April 26, 1996
(after giving effect to the stock split on

<PAGE>9


                  that day), (i) 125,804,234  shares of Parent Common Stock were
validly issued and outstanding, fully paid and nonassessable, (ii) 95,000 shares
of Parent's Series A 8% Cumulative  Convertible  Preferred  Stock,  were validly
issued and  outstanding,  fully paid,  and  nonassessable  and (iii)  15,000,000
shares of Series B Cumulative  Convertible  Preferred  Stock were validly issued
and outstanding, fully paid, and nonassessable. As of the date hereof, there are
no bonds,  debentures,  notes or other indebtedness  having the right to vote on
any matters on which the Parent's  stockholders  may vote ("Parent Voting Debt")
issued or  outstanding.  As of April 26, 1996 (after  giving effect to the stock
split on that day),  except for options to acquire  20,614,274  shares of Parent
Common  Stock  pursuant  to the  Parent's  1992 Stock Plan and 1993 Stock  Plan,
warrants to purchase  1,500,000  shares of Parent Common Stock,  commitments  to
issue shares of Parent Common Stock under  Parent's  Shareworks  and  Shareworks
Plus  programs  and  commitments  to issue  shares  of  Parent  Common  Stock to
non-employee  directors  pursuant to Parent's  1993 Stock Plan,  and,  except as
provided herein and in the Parent Rights Plan,  there are no options,  warrants,
calls  or  other  rights,   agreements  or  commitments   presently  outstanding
obligating Parent to issue,  deliver or sell shares of its capital stock or debt
securities, or obligating Parent to grant, extend or enter into any such option,
warrant, call or other such right, agreement or commitment. All of the shares of
Parent Common Stock  issuable in accordance  with this Agreement in exchange for
Company  Common Stock at the Closing will be, when so issued,  duly  authorized,
validly  issued,  fully paid and  nonassessable  and shall be delivered free and
clear of any pledge, lien, security interest,  mortgage,  charge, claim, equity,
option,  proxy,  voting  restriction,  right of  first  refusal,  limitation  on
disposition,  adverse  claim  of  ownership  or use or  encumbrance  of any kind
("Encumbrances"), including any preemptive rights of any stockholder of Parent.

                  Section 3.3 Subsidiaries.  The only "Significant Subsidiaries"
(as such term is defined in Rule 1-02 of Regulation  S-X of the  Securities  and
Exchange Commission (the "Commission"))  ("Significant  Subsidiaries") of Parent
are those named in Section 4.3 of the Parent  Disclosure  Letter or set forth on
Exhibit 22 to  Parent's  Annual  Report on Form 10-K for the  fiscal  year ended
December 31, 1995. Each Significant Subsidiary incorporated in the United States
is a corporation duly organized, validly existing and in good standing under the
laws of its jurisdiction of  incorporation  and has the corporate power to carry
on its  business  as it is now  being  conducted  or  currently  proposed  to be
conducted.   Each  Significant   Subsidiary  is  duly  qualified  as  a  foreign
corporation to do business,  and is in good standing, in each jurisdiction where
the character of its  properties  owned or held under lease or the nature of its
activities makes such qualification  necessary except where the failure to be so
qualified will not have a Parent Material Adverse Effect. Except as disclosed in
Section 4.3 of the Parent Disclosure Letter, all

<PAGE>10


                  the  outstanding  shares of capital stock of each  Significant
Subsidiary are validly issued,  fully paid and nonassessable and owned by Parent
or by a  Significant  Subsidiary  of Parent free and clear of any  Encumbrances.
There are no existing options,  warrants,  calls or other rights,  agreements or
commitments of any character relating to the issued or unissued capital stock or
other securities of any of the Significant Subsidiaries of Parent. Except as set
forth in the  Parent's  Annual  Report on Form 10-K for the  fiscal  year  ended
December 31, 1995, as disclosed in Section 4.3 of the Parent  Disclosure  Letter
and except for wholly owned  subsidiaries which are formed after the date hereof
in the ordinary  course of business,  Parent does not directly or indirectly own
any  interest  in any other  corporation,  partnership,  joint  venture or other
business association or entity that is a Significant Subsidiary.

                  Section 3.4       Authority Relative to the Agreement.

                  (a) Parent has the corporate power to execute and deliver this
         Agreement and to carry out its obligations hereunder. The execution and
         delivery of this  Agreement and the  consummation  of the  transactions
         contemplated  hereby have been duly  authorized  by  Parent's  Board of
         Directors.  The Agreement constitutes a valid and binding obligation of
         Parent, enforceable against Parent in accordance with its terms, except
         as  enforcement  may be  limited  by  bankruptcy,  insolvency  or other
         similar laws affecting the enforcement of creditors'  rights  generally
         and except  that the  availability  of  equitable  remedies,  including
         specific performance,  is subject to the discretion of the court before
         which  any  proceeding  therefor  may be  brought.  No other  corporate
         proceedings  on the part of  Parent  are  necessary  to  authorize  the
         execution and delivery by Parent of this Agreement or the  consummation
         of the transactions contemplated hereby.

                  (b) The  execution  and  delivery  of this  Agreement  and the
         consummation of the transactions contemplated hereby, does not and will
         not result in the change in  conversion  ratios,  conversion  rights or
         voting  rights,  or the  breach,  violation,  default  (with or without
         notice  or  lapse of  time,  or  both),  termination,  cancellation  or
         acceleration  of any  obligation,  or the loss of a  material  benefit,
         under (i) the  Parent's  charter or by-laws  or (ii) any  indenture  or
         other loan document  provision or other contract,  license,  franchise,
         permit,  order,  decree,  concession,   lease,  instrument,   judgment,
         statute, law, ordinance, rule or regulation applicable to Parent or any
         of its  subsidiaries or their  respective  properties or assets,  other
         than, in the case of clause (ii) only,  (A) any  breaches,  violations,
         defaults, terminations,  cancellations,  accelerations or losses which,
         either  singly  or in the  aggregate,  will not have a Parent  Material
         Adverse Effect or prevent the

<PAGE>11


                  consummation of the transactions  contemplated  hereby and (B)
         the laws and regulations referred to in the next paragraph.

                  (c)  Except  as   disclosed  in  Section  4.4  of  the  Parent
         Disclosure  Letter,  or in  connection,  or  in  compliance,  with  the
         provisions of the Hart-Scott-Rodino Antitrust Improvements Act of 1976,
         as amended (the "HSR Act"), the Securities Act of 1933, as amended (the
         "Securities  Act"), the Securities  Exchange Act of 1934 (the "Exchange
         Act"), and the corporation,  securities or blue sky laws or regulations
         of  the  various   states,   no  filing  or   registration   with,   or
         authorization,  consent or approval of, any public body or authority is
         necessary  for  the   consummation   by  Parent  of  the   transactions
         contemplated  by this  Agreement,  other than  filings,  registrations,
         authorizations,  consents or approvals  the failure of which to make or
         obtain will not have a Parent  Material  Adverse  Effect or prevent the
         consummation of the transactions contemplated hereby.

                  Section  3.5  Reports  and  Financial  Statements.  Parent has
previously furnished the Company with true and complete copies of its (i) Annual
Report on Form 10-K,  as amended,  for the fiscal years ended  December 31, 1994
and December  31,  1995,  as filed with the  Commission,  (ii) proxy  statements
related to all meetings of its  stockholders  (whether  annual or special) since
January 1, 1994, and (iii) all other reports or registration statements filed by
Parent  with the  Commission  under the  Exchange  Act since  December  31, 1992
through  the date  hereof,  except  Quarterly  Reports  on Form 10-Q for  fiscal
quarters  ended  prior to  December  31,  1995 (the items in clauses (i) through
(iii) being referred to herein collectively as the "Parent SEC Reports").  As of
their respective dates, the Parent SEC Reports complied in all material respects
with the  requirements of the Exchange Act, and the rules and regulations of the
Commission  thereunder  applicable  to such  Parent  SEC  Reports.  As of  their
respective dates, the Parent SEC Reports did not contain any untrue statement of
a material fact or omit to state a material  fact required to be stated  therein
or necessary to make the statements therein, in light of the circumstances under
which  they were  made,  not  misleading.  The  audited  consolidated  financial
statements and unaudited interim financial  statements of Parent included in the
Parent SEC Reports  comply as to form in all material  respects with  applicable
accounting  requirements  and with the published  rules and  regulations  of the
Commission with respect thereto. The financial statements included in the Parent
SEC Reports: have been prepared in accordance with generally accepted accounting
principles  applied on a consistent basis (except as may be indicated therein or
in the notes thereto);  present fairly, in all material respects,  the financial
position of Parent and its  subsidiaries as at the dates thereof and the results
of their  operations and cash flows for the periods then ended  subject,  in the
case of the unaudited  interim  financial  statements,  to normal year-end audit
adjustments, any other

<PAGE>12


                  adjustments  described  therein  and  the  fact  that  certain
information  and notes have been  condensed  or omitted in  accordance  with the
Exchange  Act and the  rules  promulgated  thereunder;  and are in all  material
respects, in accordance with the books of account and records of Parent.

                  Section  3.6 Absence of Certain  Changes or Events.  Except as
disclosed in the Parent SEC Reports or as disclosed in Section 4.6 of the Parent
Disclosure  Letter,  from December 31, 1995 through the date of this  Agreement,
there has not been (i) any  transaction,  commitment,  dispute or other event or
condition  (financial  or  otherwise)  of any  character  (whether or not in the
ordinary course of business)  individually  or in the aggregate  having a Parent
Material  Adverse  Effect  (other  than  as a  result  of  changes  in  laws  or
regulations  of general  applicability);  (ii) any damage,  destruction or loss,
whether or not covered by insurance,  which would have a Parent Material Adverse
Effect; or (iii) any entry into any commitment or transaction material to Parent
and its  subsidiaries  taken  as a whole  (including,  without  limitation,  any
borrowing  or  sale  of  assets)  except  in the  ordinary  course  of  business
consistent with past practice.

                                   Article IV.

                                   ADJUSTMENTS

                  Section 4.1.  Distributions; Adjustment upon Changes in
Capitalization.

                  (a) Any dividends or other  distributions  (whether payable in
         cash,  stock or  otherwise)  by the Company  with respect to any Shares
         purchased  hereunder  with a record date on or after the  Closing  Date
         will belong to Parent.  If any such dividend or distribution  belonging
         to Parent is paid by the Company to the  Stockholder,  the  Stockholder
         shall hold such  dividend or  distribution  in trust for the benefit of
         Parent and shall promptly remit such dividend or distribution to Parent
         in exactly the form received, accompanied by appropriate instruments of
         transfer.

                  (b) If on or after  the  date of this  Agreement  there  shall
         occur any stock dividend, stock split, recapitalization, combination or
         exchange  of shares,  merger,  consolidation,  reorganization  or other
         change or transaction of or by the Company, as a result of which shares
         of any class of stock,  other securities,  cash or other property shall
         be issued in respect  of any  Shares or if any Shares  shall be changed
         into the same or another class of stock or other securities, then, upon
         exercise of the Option,  Parent shall receive for the  aggregate  price
         payable  upon  exercise of the Option with  respect to the Shares,  all
         such shares of stock, other securities,  cash or other property issued,
         delivered  or  received  with  respect to such Shares (or if the Option
         shall not be exercised, appropriate adjustment shall

<PAGE>13


                  be made for purposes of the calculations set forth in this
Agreement).

                                   Article V.

                  Section 5.1.  No Solicitation of Transactions.

                  Each Stockholder  covenants and agrees that in its capacity as
a stockholder  of the Company it shall not,  directly or  indirectly,  take (nor
shall the  Stockholder  authorize or permit its officers,  directors,  partners,
stockholders,   employees,   representatives,   investment  bankers,  attorneys,
accountants or other agents or affiliates (the  "Representatives"),  to take and
the Representatives  shall not take, on behalf of the Stockholder) any action to
(i) encourage, solicit or initiate the submission of any Acquisition Proposal or
a  proposal  for the  acquisition,  purchase  or option to  purchase  any of the
Shares,  (ii) enter into any agreement with respect to any Acquisition  Proposal
or any acquisition or purchase of all or any of the Shares or (iii)  participate
in any way in discussions or  negotiations  with, or furnish any information to,
any  person in  connection  with,  or take any other  action to  facilitate  any
inquiries or the making of any proposal that  constitutes,  or may reasonably be
expected  to lead to,  any  Acquisition  Proposal  or a  proposal  to acquire or
purchase any of the Shares. The Stockholder will promptly  communicate to Parent
any solicitation  received by it in its capacity as a stockholder of the Company
with  respect  to an  Acquisition  Proposal  and the terms of such  proposal  or
inquiry,  including  the  identity of the person and its  affiliates  making the
same,  that it may  receive in respect of any such  transaction,  or of any such
information  requested from it or of any such  negotiations or discussions being
sought to be initiated with it.  "Acquisition  Proposal" shall mean any proposed
(A) merger,  consolidation  or similar  transaction  involving the Company,  (B)
sale,   lease  or  other   disposition   directly  or   indirectly   by  merger,
consolidation,  share  exchange  or  otherwise  of assets of the  Company or its
subsidiaries  representing 10% or more of the consolidated assets of the Company
and its subsidiaries  other than in the ordinary course of business,  (C) issue,
sale, or other disposition of (including by way of merger, consolidation,  share
exchange or any similar transaction)  securities (or options, rights or warrants
to  purchase,   or  securities   convertible  into  or  exchangeable  for,  such
securities)  representing  10% or more of the voting power of the Company or (D)
transaction in which any person shall acquire beneficial ownership (as such term
is  defined  in Rule  13d-3  under the  Exchange  Act),  or the right to acquire
beneficial  ownership or any "group" (as such term is defined under the Exchange
Act) shall have been formed which  beneficially owns or has the right to acquire
beneficial ownership of 25% or more of the outstanding Common Stock.



<PAGE>14


                                   Article VI.

                         Covenants of the Stockholders.

                  Section 6.1.  Negative Covenants.  Each Stockholder agrees,
until the Option has terminated, not to:

                  (a) sell, transfer, pledge, assign or otherwise dispose of, or
         enter into any contract,  option or other  arrangement  with respect to
         the sale,  transfer,  pledge,  assignment or other  disposition of, the
         Shares  owned by such  Stockholder  to any person  other than Parent or
         Parent's designee and except as contemplated in Exhibit A;

                  (b) acquire any additional  shares of Common Stock without the
         prior consent of Parent other than pursuant to rights under the Company
         Employees  Stock  Purchase Plan or options  outstanding  on the date of
         this Agreement; or

                  (c) deposit any Shares into a voting trust or grant a proxy or
         enter into a voting  agreement  with respect to any Shares,  except for
         this Agreement.

                  Section 6.2. Further Assurances.  If Parent shall exercise the
Option in  accordance  with the terms of this  Agreement,  from time to time and
without  additional  consideration the Stockholder will execute and deliver,  or
cause to be  executed  and  delivered,  such  additional  or further  transfers,
assignments,   endorsements,  consents  and  other  instruments  as  Parent  may
reasonably request for the purpose of effectively  carrying out the transactions
contemplated by this  Agreement,  including the transfer of the Shares to Parent
and the release of any and all Encumbrances with respect thereto.

                                  Article VII.

                                  MISCELLANEOUS

                  Section 7.1.  Non-Survival of Representations, Warranties and
Agreements.  All representations, warranties and agreements made by the parties
to this Agreement shall terminate at the Closing.

                  Section 7.2.  Expenses.  Except as otherwise  provided herein,
all costs and expenses incurred in connection with the transactions contemplated
by this Agreement shall be paid by the party incurring such costs and expenses.

                  Section  7.3.  Notices.  All  notices or other  communications
under this  Agreement  shall be in  writing  and shall be given by  delivery  in
person,  by  facsimile,  cable,  telegram,  telex  or  other  standard  form  of
telecommunications,  or by registered or certified mail, postage prepaid, return
receipt requested, addressed as follows (or such other address for a

<PAGE>15


                  party as shall be specified  in a notice  given in  accordance
with this  Section  6.3) and shall be deemed to have been given one business day
after transmission by facsimile,  cable, telegram,  telex of other standard form
of telecommunications or four days after deposit in the U.S. mail:

         If to a  Stockholder,  at the  address  or  facsimile  number  of  such
Stockholder set forth on Exhibit A, with a copy to:

                           UUNET Technologies, Inc.
                           3060 Williams Drive
                           Fairfax, VA  22031
                           Attention:  General Counsel
                           Facsimile No.:  (703) 206-5807

                           and

                           Heller Ehrman White & McAuliffe
                           525 University Avenue
                           Palo Alto, CA  94301
                           Attn:  August J. Moretti
                                      and Richard Friedman
                           Facsimile:  (415) 324-0638

                  If to Parent or Sub:

                           MFS Communications Company, Inc.
                           3555 Farnam Street, 2nd Floor
                           Omaha, Nebraska  68131
                           Attention:  General Counsel
                           Facsimile No.:  (402) 977-5335

                           With a copy to:

                           Willkie Farr & Gallagher
                           One Citicorp Center
                           153 East 53rd Street
                           New York, New York  10022
                           Attention:  John S. D'Alimonte, Esq.
                           Facsimile No.:  (212) 821-8111

                  Section  7.4.  Severability.  Any  term or  provision  of this
Agreement which is invalid or  unenforceable  in any  jurisdiction  shall, as to
that  jurisdiction,   be  ineffective  to  the  extent  of  such  invalidity  or
unenforceability  without rendering invalid or unenforceable the remaining terms
and provisions of this Agreement or affecting the validity or  enforceability of
any of the terms or provisions of this Agreement in any other  jurisdiction.  If
any  provision  of  this  Agreement  is so  broad  as to be  unenforceable,  the
provision shall be interpreted to be only so broad as is enforceable.

                  Section 7.5.  Entire Agreement. This Agreement and any
documents delivered by the parties in connection herewith

<PAGE>16


                  constitute the entire agreement among the parties with respect
to  the  subject   matter  hereof  and  supersede  all  prior   agreements   and
understandings  among the  parties  with  respect  thereto.  No  addition  to or
modification  of any provision of this Agreement shall be binding upon any party
hereto unless made in writing and signed by all parties hereto.

                  Section  7.6.   Assignment,   Binding  Effect.   Neither  this
Agreement nor any of the rights,  interests or  obligations  hereunder  shall be
assigned by any of the parties hereto (whether by operation of law or otherwise)
without the prior written  consent of the other  parties,  except that Parent or
Sub may  assign  all or any of their  rights and  obligations  hereunder  to any
affiliate of Parent,  provided that no such  assignment  shall relieve Parent or
Sub of its  obligations  hereunder  if  such  assignee  does  not  perform  such
obligations.  Subject to the preceding sentence, this Agreement shall be binding
upon and shall inure to the benefit of the parties  hereto and their  respective
successors and assigns.  Notwithstanding anything contained in this Agreement to
the contrary,  nothing in this Agreement,  expressed or implied,  is intended to
confer  on any  person  other  than  the  parties  hereto  or  their  respective
successors and assigns any rights, remedies, obligations or liabilities under or
by reason of this Agreement.

                  Section 7.7.  Specific  Performance.  The parties hereto agree
that  irreparable  damage would occur in the event that any of the provisions of
this  Agreement was not performed in accordance  with its specific  terms or was
otherwise breached.  It is accordingly agreed that the parties shall be entitled
to an injunction or  injunctions  to prevent  breaches of this  Agreement and to
enforce specifically the terms and provisions hereof in any Delaware Court, this
being in  addition to any other  remedy to which they are  entitled at law or in
equity.

                  Section 7.8.  Governing Law.  This Agreement shall be
governed by and construed in accordance with the laws of the State of Delaware,
without regard to its rules of conflict of laws.

                  Section 7.9.  Headings.  Headings of the Articles and
Sections of this Agreement are for the convenience of the parties only, and
shall be given no substantive or interpretive effect whatsoever.

<PAGE>17






                  Section 7.10. Counterparts.  This Agreement may be executed
by the parties hereto in separate counterparts,  each of which when so executed
and delivered  shall  be an  original,  but all  such  counterparts  shall
together constitute one and the same instrument. Each counterpart may consist
of a number of copies hereof each signed by less than all, but together signed
by all of the parties hereto.



                            [Signature Pages follow.]



<PAGE>18




                  IN WITNESS  WHEREOF,  Parent has caused this  Agreement  to be
executed by its officers  thereunto  duly  authorized and each  Stockholder  has
caused  this  Agreement  to be  executed,  or  duly  executed  by an  authorized
signatory, all as of the date first written above.

                                             MFS COMMUNICATIONS COMPANY, INC.



                                             By          /s/ James Q. Crowe
                                                  Name:  James Q. Crowe
                                                  Title: Chairman & CEO


                                             MFS GLOBAL INTERNET SERVICES, INC.



                                             By          /s/ James Q. Crowe
                                                  Name:  James Q. Crowe
                                                  Title: President


                                              [Entity Stockholder]





                                             By
                                                  Name:
                                                  Title:



                                              [Individual Stockholder]


<PAGE>19


                                                                      Exhibit A

                              List of Stockholders



                     Name and address                           Number of Shares
                     of Stockholder                             of Common Stock

    Richard L. Adams, Jr.                                         4,700,000(1)
    c/o UUNET Technologies, Inc.
    3060 Williams Drive
    Fairfax, VA  22031
    Facsimile:  (703) 206-5805

    Microsoft Corporation                                           4,164,000
    1 Microsoft Way
    Redmond, WA  98052
    Attn:   Robert Eschelman
    Facsimile:  (206) 869-1327

    Menlo Ventures IV, L.P.                                         2,563,031
    Menlo Evergreen V, L.P.                                          666,667
    3000 Sand Hill Road
    Building 4, Suite 100
    Menlo Park, CA  94025
    Attn:  John W. Jarve
    Facsimile:  (415) 854-7059

    John W. Sidgmore                                              1,091,455(2)
    c/o UUNET Technologies, Inc.
    3060 Williams Drive
    Fairfax, VA  22031
    Facsimile:  (703) 206-5805

    New Enterprise Associates V,                                    3,229,698
      Limited Partnership
    1119 St. Paul Street
    Baltimore, MD  21202
    Attn:  Peter J. Barris and
           Nancy Dorman
    Facsimile:  (410) 752-7721

    Accel IV L.P.                                                   2,958,403
    Accel Investors '93 L.P.                                         119,499
    One Palmer Square
    Princeton, NJ  08542
    Attn:  Carter Sednaoui
    Facsimile:  (609) 683-0384


<PAGE>20









    Les B. Straus                                                    53,472
    PictureTel
    The Tower at Northwoods
    222 Rosewood Drive
    Danvers, MA  01923
    Facsimile:  (508) 762-5219

    Daniel C. Lynch                                                  34,500
    25560 La Lanne Court
    Los Altos Hills, CA  94022
    Facsimile:  (415) 948-0757                                     __________

                          TOTAL                                    19,580,725


- ---------------------

(1)      Of the 4,700,000 shares held by Mr. Adams,  325,000 shares may be sold,
         gifted  or  otherwise   transferred   without  restriction  under  this
         Agreement prior to the Closing.

(2)      Of the 1,091,455  shares held by Mr.  Sidgmore,  355,458 of such shares
         are subject to a right of  repurchase  by the  Company if Mr.  Sidgmore
         voluntarily  terminates his employment with the Company before June 27,
         1996.  In addition,  as of April 30,  1996,  the Company has a right of
         repurchase  with respect to another 562,807 of such shares in the event
         that Mr. Sidgmore's employment with the Company is terminated and which
         right of  repurchase  expires with  respect to 14,810.70  shares of the
         last  day of  each  calendar  month  so long  as Mr.  Sidgmore  remains
         employed  by the  Company;  provided,  that  such  right of  repurchase
         expires with respect to 50 percent of such shares subject to a right of
         repurchase  in  the  event  of  a  Change  in  Control  or  involuntary
         Termination  Other Than For Cause (each, as defined in the Nonstatutory
         Stock Option Agreement between the Company and Mr. Sidgmore dated as of
         July 20, 1994).



<PAGE>1
                                                                 Conformed Copy










                               AGREEMENT AND PLAN
                                    OF MERGER
                                   DATED AS OF
                                 APRIL 29, 1996
                                      AMONG
                        MFS COMMUNICATIONS COMPANY, INC.
                       MFS GLOBAL INTERNET SERVICES, INC.
                                       AND
                            UUNET TECHNOLOGIES, INC.













<PAGE>2


                                TABLE OF CONTENTS


ARTICLE I.  THE MERGER....................................................2

         Section 1.1.  The Merger.........................................2
         Section 1.2.  Effective Date of the Merger.......................2

ARTICLE II.  THE SURVIVING CORPORATION....................................2

         Section 2.1.  Certificate of Incorporation.......................2
         Section 2.2.  By-Laws............................................2
         Section 2.3.  Board of Directors; Officers.......................2
         Section 2.4.  Effects of Merger..................................3

ARTICLE III.  CONVERSION OF SHARES........................................3

         Section 3.1.  Exchange Ratio.....................................3
         Section 3.2.  Parent to Make Certificates Available..............3
         Section 3.3.  Dividends; Transfer Taxes..........................5
         Section 3.4.  No Fractional Shares...............................5
         Section 3.5.  Stock Options......................................6
         Section 3.6.  Stockholders' Meetings.............................7
         Section 3.7.  Closing of the Company's Transfer Books............8
         Section 3.8.  Assistance in Consummation of the Merger...........8
         Section 3.9.  Closing............................................9
         Section 3.10.  No Further Rights in Company Common Stock.........9
         Section 3.11.  No Liability......................................9
         Section 3.12.  Withholding Rights................................9

ARTICLE IV.  REPRESENTATIONS AND WARRANTIES OF PARENT.....................9

         Section 4.1.  Organization and Qualification.....................9
         Section 4.2.  Capitalization.....................................10
         Section 4.3.  Subsidiaries.......................................10
         Section 4.4.  Authority Relative to this Merger Agreement........11
         Section 4.5.  Reports and Financial Statements...................12
         Section 4.6.  Absence of Certain Changes or Events...............13
         Section 4.7.  Employee Benefit Plans.............................13
         Section 4.8.  ERISA..............................................14
         Section 4.9.  Parent Action......................................15
         Section 4.10.  Fairness Opinion..................................15
         Section 4.11.  No Brokers........................................15
         Section 4.12.  Parent Ownership of Company Common Stock..........15

ARTICLE V.  REPRESENTATIONS AND WARRANTIES OF THE COMPANY.................15

         Section 5.1.  Organization and Qualification.....................15
         Section 5.2.  Capitalization.....................................16
         Section 5.3.  Subsidiaries.......................................16
         Section 5.4.  Authority Relative to this Merger Agreement........17


<PAGE>3


         Section 5.5.  Reports and Financial Statements.....................18
         Section 5.6.  Absence of Certain Changes or Events.................19
         Section 5.7.  Employee Benefit Plans...............................19
         Section 5.8.  ERISA................................................20
         Section 5.9.  Takeover Provisions Inapplicable.....................20
         Section 5.10.  Company Action......................................21
         Section 5.11.  Fairness Opinion....................................21
         Section 5.12.  No Brokers..........................................21

ARTICLE VI.  REPRESENTATIONS AND WARRANTIES REGARDING SUB...................21

         Section 6.1.  Organization.........................................21
         Section 6.2.  Capitalization.......................................21
         Section 6.3.  Authority Relative to this Merger Agreement..........22

ARTICLE VII.  CONDUCT OF BUSINESS PENDING THE MERGER........................22

         Section 7.1.  Conduct of Business by the Company Pending the
                       Merger...............................................22
         Section 7.2.  Conduct of Business by Parent Pending the Merger.....26
         Section 7.3.  Conduct of Business of Sub...........................26
         Section 7.4.  Notice of Breach.....................................26

ARTICLE VIII.  ADDITIONAL AGREEMENTS........................................26

         Section 8.1.  Access and Information...............................26
         Section 8.2.  Registration Statement/Proxy Statement...............27
         Section 8.3.  Compliance with the Securities Act...................28
         Section 8.4.  Listing..............................................28
         Section 8.5.  Indemnification......................................28
         Section 8.6.  HSR Act..............................................31
         Section 8.7.  Additional Agreements................................31
         Section 8.8.  No Solicitation......................................32
         Section 8.9.  Limitation on Acquisition Activities.................33
         Section 8.10.  Notice of Actions...................................33
         Section 8.11.  Benefit Plans Generally.............................33
         Section 8.12.  Stockholders' Rights Plan...........................34

ARTICLE IX.  CONDITIONS PRECEDENT...........................................34

         Section 9.1.  Conditions to Each Party's Obligation to Effect the
                       Merger...............................................34
         Section 9.2.  Conditions to Obligation of the Company to Effect
                       the Merger...........................................35
         Section 9.3.  Conditions to Obligations of Parent and Sub to Effect
                       the Merger...........................................35

ARTICLE X.  TERMINATION, AMENDMENT AND WAIVER...............................36

         Section 10.1.  Termination.........................................36
         Section 10.2.  Effect of Termination...............................38


<PAGE>4


         Section 10.3.  Amendment...........................................38
         Section 10.4.  Extension; Waivers..................................38

ARTICLE XI.  GENERAL PROVISIONS.............................................38

         Section 11.1.  Non-Survival of Representations, Warranties and
                        Agreements..........................................38
         Section 11.2.  Notices.............................................39
         Section 11.3.  Fees and Expenses...................................40
         Section 11.4.  Publicity...........................................41
         Section 11.5.  Specific Performance................................41
         Section 11.6.  Assignment; Binding Effect..........................42
         Section 11.7.  Entire Agreement....................................42
         Section 11.8.  Governing Law.......................................42
         Section 11.9.  Counterparts........................................42
         Section 11.10.  Headings, Table of Contents, Index of Defined
                         Terms..............................................42
         Section 11.11.  Interpretation.....................................42
         Section 11.12.  Waivers............................................43
         Section 11.13.  Severability.......................................43
         Section 11.14.  Subsidiaries.......................................43

Exhibit 1.1(a) - The Stock Option Agreement Exhibit 1.1(b) - The Parent Voting
                 Agreement
Exhibit 8.3(a) - The Affiliate Letter


<PAGE>5





                             Index of Defined Terms



Acquisition Proposal........................................................32
Affiliate...................................................................28

Certificates.................................................................4
Claim.......................................................................30
Code.........................................................................1
Commission..................................................................10
Company......................................................................1
Company Benefit Plans.......................................................19
Company Common Stock.........................................................3
Company Disclosure Letter...................................................16
Company ERISA Affiliate.....................................................20
Company Material Adverse Effect.............................................15
Company Meeting..............................................................8
Company SEC Reports.........................................................18

DGCL.........................................................................3

Effective Date...............................................................2
Encumbrances................................................................10
ERISA.......................................................................13
Excess Shares................................................................6
Exchange Act................................................................12
Exchange Agent...............................................................3
Exchange Fund................................................................4
Exchange Ratio...............................................................3

Form S-4....................................................................27
Fractional Securities Fund...................................................6

HSR Act.....................................................................12

Indemnified Party...........................................................29
IRS.........................................................................14

Merger.......................................................................1
Merger Agreement.............................................................1
MS 17
MS Agreement................................................................17

Nasdaq.......................................................................6

Options.....................................................................16
Outstanding Options..........................................................6

Parent.......................................................................1
Parent Benefit Plans........................................................14
Parent Common Stock..........................................................3
Parent Disclosure Letter....................................................10
Parent ERISA Affiliate......................................................14
Parent Material Adverse Effect..............................................10


<PAGE>6


Parent Meeting...............................................................8
Parent Rights Plan...........................................................3
Parent SEC Reports..........................................................12
Parent Share Proposal........................................................8
Parent Stock Split...........................................................3
Parent Voting Agreement......................................................1
Parent Voting Debt..........................................................10
Permitted Options...........................................................23
Proposed Transactions.......................................................16
Proxy Statement/Prospectus..................................................27
Purchase Event..............................................................37

Securities Act..............................................................12
Share Consideration..........................................................4
Significant Subsidiaries....................................................10
Stock Option Agreement.......................................................1
Stock Option Plans...........................................................6
Stock Purchase Plan..........................................................7
Sub..........................................................................1
Surviving Corporation........................................................2

Voting Debt.................................................................16



<PAGE>7


                          AGREEMENT AND PLAN OF MERGER


                  THIS  AGREEMENT  AND PLAN OF MERGER (the "Merger
Agreement"), dated as of April 29, 1996,  by and among MFS  COMMUNICATIONS
COMPANY,  INC., a Delaware corporation ("Parent"),  MFS GLOBAL INTERNET
SERVICES, INC., a Delaware corporation  and  a  wholly  owned  subsidiary  of
Parent  ("Sub"),  and  UUNET TECHNOLOGIES, INC., a Delaware corporation (the
"Company").

                              W I T N E S S E T H:

                  WHEREAS,  Parent and the  Company  desire to effect a business
combination  (the  "Merger")  by  means of the  merger  of Sub with and into the
Company;

                  WHEREAS,  the  Boards  of  Directors  of  Parent,  Sub and the
Company have approved the Merger,  upon the terms and subject to the  conditions
set forth herein;

                  WHEREAS,  as a condition and  inducement to Parent's and Sub's
entering into this Merger  Agreement and  incurring  the  obligations  set forth
herein,  concurrently  with the execution and delivery of this Merger Agreement,
Parent is entering into a Stockholder  Option,  Voting and Proxy  Agreement with
certain  stockholders of the Company,  in the form of Exhibit 1.1(a) (the "Stock
Option  Agreement"),  pursuant to which,  among other things,  such stockholders
have agreed to grant  Parent the  irrevocable  option to purchase  the shares of
Company Common Stock owned by such  stockholders;  and agreed to vote the shares
of Company Common Stock (as defined below) owned by such  stockholders  in favor
of the Merger  provided  for herein and to grant Parent  irrevocable  proxies to
vote such shares of Company Common Stock;

                  WHEREAS,  as a  condition  and  inducement  to  the  Company's
entering into this Merger  Agreement and  incurring  the  obligations  set forth
herein,  concurrently  with the execution and delivery of this Merger Agreement,
the Company is entering  into a Parent Voting and Proxy  Agreement  with certain
stockholders  of  Parent,  in the form of Exhibit  1.1(b)  (the  "Parent  Voting
Agreement"),  pursuant to which,  among other  things,  such  stockholders  have
agreed to vote the shares of Parent  Common  Stock (as defined  below)  owned by
such  stockholders  in favor of the Parent  Share  Proposal  (as defined  below)
provided  for herein and to grant the Company  irrevocable  proxies to vote such
shares of Parent Common Stock;

                  WHEREAS, for Federal income tax purposes, it is intended that
the Merger shall qualify as a reorganization within

<PAGE>8


                  the meaning of Section 368(a) of the Internal Revenue Code of
1986, as amended (the "Code");

                  NOW, THEREFORE, in consideration of the foregoing premises and
the  representations,  warranties and agreements  contained herein,  the parties
hereto agree as follows:

                                   ARTICLE I.

                                   THE MERGER

                  Section  1.1.  The  Merger.  Upon the terms and subject to the
conditions  hereof, on the Effective Date (as defined in Section 1.2), Sub shall
be merged  with and into the  Company and the  separate  existence  of Sub shall
thereupon  cease,  and the Company,  as the surviving  corporation in the Merger
(the  "Surviving  Corporation"),  shall by virtue  of the  Merger  continue  its
corporate existence under the laws of the State of Delaware.

                  Section 1.2.  Effective  Date of the Merger.  The Merger shall
become  effective  at the date and time (the  "Effective  Date") when a properly
executed  Certificate of Merger is duly filed with the Secretary of State of the
State of Delaware,  which filing shall be made as soon as practicable  following
fulfillment of the  conditions  set forth in Article IX hereof,  or at such time
thereafter as is provided in such Certificate.

                                   ARTICLE II.

                            THE SURVIVING CORPORATION

                  Section 2.1. Certificate of Incorporation.  Subject to Section
8.5 of this Merger  Agreement,  after the Effective  Date,  the  Certificate  of
Incorporation of the Surviving  Corporation shall be amended and restated in its
entirety  to  read  as the  Certificate  of  Incorporation  of Sub as in  effect
immediately  prior to the  Effective  Date,  except  that  Article  One shall be
amended to read as follows:  "The name of the Corporation is UUNET TECHNOLOGIES,
INC."

                  Section  2.2.  By-Laws.  Subject to Section 8.5 of this Merger
Agreement,  after  the  Effective  Date,  the  By-laws  of  Sub,  as  in  effect
immediately  prior to the Effective Date,  shall be the By-laws of the Surviving
Corporation  until  thereafter  amended as provided by law, the  Certificate  of
Incorporation of the Surviving Corporation and such By-laws.



<PAGE>9


                  Section 2.3.  Board of Directors;  Officers.  The directors of
Sub  immediately  prior to the Effective  Date and John W. Sidgmore shall be the
directors  of  the  Surviving  Corporation  and  the  officers  of  the  Company
immediately  prior to the Effective  Date shall be the officers of the Surviving
Corporation, in each case until their respective successors are duly elected and
qualified.

                  Section 2.4.  Effects of Merger.  The Merger shall have the
effects set forth in Section 259 of the Delaware General Corporation Law (the
"DGCL").

                                  ARTICLE III.

                              CONVERSION OF SHARES

                  Section 3.1.  Exchange Ratio.  On the Effective Date, by
virtue of the Merger and without any action on the part of any holder of any
common stock, $0.001 par value, of the Company ("Company Common Stock"):

                  (a) All shares of Company  Common  Stock which are held by the
         Company or any  subsidiary  of the  Company,  and any shares of Company
         Common Stock owned by Parent,  Sub or any other  subsidiary  of Parent,
         shall be canceled.

                  (b) Subject to Section 3.4, each remaining  outstanding  share
         of Company Common Stock shall be converted into and represent the right
         to receive 1.777776,  subject to adjustment  pursuant to Section 3.1(c)
         (as may be adjusted, the "Exchange Ratio") fully paid and nonassessable
         shares of the common  stock,  $.01 par value,  of Parent  (the  "Parent
         Common  Stock"),  which  reflects the stock split of the Parent  Common
         Stock  that was paid on April 26,  1996  (the  "Parent  Stock  Split"),
         together with the associated  rights under Parent's  Rights  Agreement,
         dated as of September 30, 1995,  between Parent and  Continental  Stock
         Transfer & Trust Company (the "Parent Rights Plan").

                  (c)  In  the  event  of  any  stock  dividend,   stock  split,
         reclassification,  recapitalization,  combination or exchange of shares
         with respect to, or rights  issued in respect of,  Parent  Common Stock
         other than the Parent Stock Split after the date  hereof,  the Exchange
         Ratio shall be adjusted accordingly.



<PAGE>10


                  (d) Each issued and outstanding  share of capital stock of Sub
         shall be  converted  into and become  one fully paid and  nonassessable
         share of Common Stock, $.01 par value, of the Surviving Corporation.

                  Section 3.2.  Parent to Make Certificates Available.

                  (a)  Prior  to  the  Effective  Date,   Parent  shall  appoint
         Continental  Stock  Transfer and Trust Company to act as exchange agent
         (the "Exchange  Agent") for the Merger.  At the Effective Date,  Parent
         shall deposit with the Exchange  Agent,  for the benefit of the holders
         of shares of Company Common Stock, for exchange in accordance with this
         Article III,  through the Exchange Agent,  certificates  representing a
         number of shares of Parent  Common Stock equal to the product  (rounded
         down to the nearest whole number) of the Exchange  Ratio  multiplied by
         the number of shares of Company  Common Stock  outstanding  immediately
         prior to the  Effective  Date.  For  purposes of the Merger  Agreement,
         shares  of  Parent  Common  Stock,   together  with  any  dividends  or
         distributions with respect thereto,  are hereinafter referred to as the
         "Exchange  Fund" and such shares of Parent Common Stock, is hereinafter
         referred  to as the "Share  Consideration."  The  Exchange  Agent shall
         deliver the Share Consideration out of the Exchange Fund as directed by
         Parent. The Share  Consideration shall be deemed to have been issued on
         the Effective Date.

                  (b) On the Effective Date,  Parent shall instruct the Exchange
         Agent to mail to each holder of record of a certificate or certificates
         which immediately  prior to the Effective Date represented  outstanding
         shares of Company Common Stock (collectively, the "Certificates") whose
         shares were converted into the right to receive the Share Consideration
         pursuant to Section 3.1(b) within three business days of receiving from
         the  Company  a list  of  such  holders  of  record,  (i) a  letter  of
         transmittal  (which shall specify that delivery shall be effected,  and
         risk of loss and  title  to the  Certificates  shall  pass,  only  upon
         delivery of the Certificates to the Exchange Agent and shall be in such
         form and have such other  provisions as Parent may reasonably  specify)
         and  (ii)  instructions  for  use in  effecting  the  surrender  of the
         Certificates  in  exchange  for  certificates  representing  the  Share
         Consideration.  Upon surrender of a Certificate for cancellation to the
         Exchange  Agent,  together  with  such  letter  of  transmittal,   duly
         executed, and such other documents as reasonably may be required by the
         Exchange

<PAGE>11


                  Agent,  and  acceptance  thereof by the Exchange  Agent,  each
         holder of a  Certificate  shall be  entitled  to  receive  in  exchange
         therefor  certificates  representing the Share  Consideration that such
         holder  has the right to receive  pursuant  to the  provisions  of this
         Article III, and the  Certificate  so  surrendered  shall  forthwith be
         canceled.  The  Exchange  Agent  shall  accept such  Certificates  upon
         compliance  with such  reasonable  terms and conditions as the Exchange
         Agent may impose to effect an orderly  exchange  thereof in  accordance
         with normal exchange  practices.  Subject to applicable law,  following
         surrender  of any such  Certificate,  there shall be paid to the record
         holder thereof the certificates  representing  the Share  Consideration
         and cash in consideration  of fractional  shares as provided in Section
         3.4.

                  (c) Any  portion  of the  Exchange  Fund  and  the  Fractional
         Securities  Fund (as defined below) that remains  undistributed  to the
         former  stockholders  of the Company for 12 months after the  Effective
         Date shall be delivered to Parent upon demand.  Any holder of shares of
         Company Common Stock who has not exchanged his shares for Parent Common
         Stock in  accordance  with  subsection  (a) within 12 months  after the
         Effective  Date shall have no further claim upon the Exchange Agent and
         shall  thereafter  look only to Parent  for  payment  in respect of his
         shares of Company  Common  Stock.  Until so  surrendered,  certificates
         representing  Company Common Stock shall represent  solely the right to
         receive the Share Consideration.

                  (d) Notwithstanding paragraph (b) above, all shares of Company
         Common Stock subject to a right of  repurchase  which remains in effect
         following the Merger shall  continue to bear a restrictive  legend with
         respect to such right of repurchase and shall be delivered to Parent to
         hold, pending the lapse of the right of repurchase.

                  Section 3.3. Dividends;  Transfer Taxes. No dividends or other
distributions  that are declared or made on Parent  Common Stock will be paid to
persons  entitled  to receive  certificates  representing  Parent  Common  Stock
pursuant  to  this  Merger   Agreement   until  such  persons   surrender  their
Certificates representing Company Common Stock. Upon such surrender, there shall
be paid to the person in whose name the  certificates  representing  such Parent
Common Stock shall be issued any  dividends or other  distributions  which shall
have become  payable  with  respect to such Parent  Common Stock in respect of a
record date after the Effective  Date. In no event shall the person  entitled to
receive such dividends be entitled to receive interest on such dividends. In the
event  that any  certificates  for any shares of Parent  Common  Stock are to be
issued in a name other than that in which the Certificates  representing  shares
of

<PAGE>12


                  Company  Common  Stock  surrendered  in exchange  therefor are
registered,  it shall be a condition of such  exchange that the  Certificate  or
Certificates so surrendered shall be properly endorsed or be otherwise in proper
form for transfer and that the person  requesting such exchange shall pay to the
Exchange Agent any transfer or other taxes required by reason of the issuance of
certificates for such shares of Parent Common Stock in a name other than that of
the registered holder of the Certificate surrendered,  or shall establish to the
satisfaction  of the  Exchange  Agent  that  such  tax has  been  paid or is not
applicable.

                  Section 3.4. No Fractional  Shares.  No  certificates or scrip
representing less than one share of Parent Common Stock shall be issued upon the
surrender  for  exchange  of  Certificates  representing  Company  Common  Stock
pursuant to Section 3.1(b). In lieu of any such fractional share, each holder of
Company  Common Stock who would  otherwise have been entitled to a fraction of a
share of Parent  Common  Stock  upon  surrender  of  Certificates  for  exchange
pursuant  to Section  3.1(b)  shall be paid upon such  surrender  cash  (without
interest) in an amount equal to such holder's  proportionate interest in the net
proceeds  from the sale or sales in the open market by the  Exchange  Agent,  on
behalf of all such  holders,  of the  aggregate  fractional  Parent Common Stock
issued  pursuant to this  Section  3.4.  As soon as  practicable  following  the
Effective  Date, the Exchange Agent shall determine the excess of (i) the number
of full shares of Parent Common Stock  delivered to the Exchange Agent by Parent
over (ii) the  aggregate  number of full  shares  of Parent  Common  Stock to be
distributed  to holders of Company Common Stock (such excess being herein called
the "Excess Shares"), and the Exchange Agent, as agent for the former holders of
Company Common Stock,  shall sell the Excess Shares at the prevailing  prices on
The Nasdaq  Stock  Market("Nasdaq").  The  Exchange  Agent shall deduct from the
proceeds of the sale of the Excess  Shares all  commissions  and transfer  taxes
incurred in connection  with such sale of Excess Shares.  Until the net proceeds
of such sale have been  distributed to the former  stockholders  of the Company,
the Exchange Agent will hold such proceeds in trust for such former stockholders
(the  "Fractional   Securities   Fund").   As  soon  as  practicable  after  the
determination  of the  amount of cash to be paid to former  stockholders  of the
Company in lieu of any  fractional  interests,  the  Exchange  Agent  shall make
available in accordance with the terms of this Merger  Agreement such amounts to
such former stockholders.

                  Section 3.5.  Stock Options.  At or prior to the Effective
Date, the Company and Parent shall take all action necessary to cause the
assumption by Parent as of the Effective Date of the Company's 1995 Performance
Option Plan, Incentive Stock Option Plan, Equity

<PAGE>13


                  Incentive  Plan and  Nonemployee  Directors  Stock Option Plan
(the "Stock  Option  Plans").  Each of the options to  purchase  Company  Common
Stock,  whether  vested or  unvested,  issued  under the Stock  Option  Plans or
pursuant to separate option agreements outstanding as of the Effective Date (the
"Outstanding  Options") shall be converted without any action on the part of the
holder  thereof into an option to purchase  shares of Parent  Common Stock as of
the Effective  Date. The number of shares of Parent Common Stock that the holder
of an Outstanding  Option shall be entitled to receive upon the exercise of such
option shall be a number of whole shares determined by multiplying the number of
shares of Company  Common Stock subject to such option,  determined  immediately
before the Effective Date, by the Exchange Ratio. The option price of each share
of Parent  Common  Stock  subject to an  Outstanding  Option shall be the amount
(rounded up to the nearest whole cent)  obtained by dividing the exercise  price
per  share  of  Company  Common  Stock  at  which  such  option  is  exercisable
immediately  before the Effective Date by the Exchange Ratio. The assumption and
substitution  of options as provided  herein  shall not give the holders of such
options  additional  benefits or additional vesting rights (other than rights to
the  acceleration  of vesting or the lapse of the right of repurchase  caused by
the Merger  under  existing  contractual  arrangements)  which they did not have
immediately  prior  to  the  Effective  Date  or  relieve  the  holders  of  any
obligations or restrictions applicable to their options or the shares obtainable
upon exercise of the options.  After the Effective  Date, the Stock Option Plans
shall be  continued  in effect by Parent  subject  to  amendment,  modification,
suspension, abandonment or termination as provided therein, and the Stock Option
Plans as so continued  shall relate only to the issuance of Parent  Common Stock
as provided in this Section 3.5. Parent shall comply with the terms of the Stock
Option Plans and use all reasonable  efforts to ensure,  to the extent  required
by,  and  subject  to the  provisions  of such  Stock  Option  Plans,  that  the
Outstanding  Options  which  qualified as incentive  stock  options prior to the
Effective  Date  continue  to  qualify  as  incentive  stock  options  after the
Effective Date.  Parent shall take all corporate action necessary to reserve for
issuance a sufficient number of shares of Parent Common Stock for delivery under
Outstanding  Options  assumed in  accordance  with this  Section 3.5. As soon as
practicable  after  the  Effective  Date,  and not more  than one  business  day
thereafter,  Parent shall file a registration  statement on Form S-8 relating to
such  assumed  options  and shall use all  reasonable  efforts to  maintain  the
effectiveness of such registration statement (and maintain the current status of
the prospectus or  prospectuses  contained  therein) for so long as such options
remain  outstanding.  Parent shall use all reasonable efforts to qualify as soon
as practicable  after the Effective Date under  applicable state securities laws
the issuance of such shares of Parent  Common Stock  issuable  upon  exercise of
such Outstanding  Options.  With respect to those  individuals who subsequent to
the Merger will be

<PAGE>14


                  subject to the reporting  requirements  under Section 16(a) of
the Exchange  Act,  Parent  shall  administer  the Stock  Option  Plans  assumed
pursuant  to  this  Section  3.5 in a  manner  that  complies  with  Rule  16b-3
promulgated under the Exchange Act to the extent the Stock Option Plans complied
with such rule prior to the  Merger.  Upon the  earlier to occur of (i) July 31,
1996 or (ii) the trading day immediately  preceding the Effective Date, all then
outstanding rights to acquire shares of Company Common Stock under the Company's
Employee Stock Purchase Plan (the "Stock  Purchase  Plan") will be exercised for
the  purchase of shares of Company  Common  Stock.  Effective  no later than the
close of the second trading day  immediately  preceding the Effective Date, (but
in no event prior to the exercise  contemplated in the previous  sentence),  the
Board of Directors of the Company shall  terminate  the Stock  Purchase Plan and
all outstanding  options to purchase Company Common Stock thereunder.  All funds
contributed  to the Stock  Purchase  Plan  that  have not been used to  purchase
shares of Company Common Stock shall be returned,  in cash, to  participants  of
the  Stock  Purchase  Plan as  soon  as  administratively  feasible  after  such
termination date, in accordance with Section 17(b) of the Stock Purchase Plan.

                  Section 3.6.  Stockholders' Meetings.

                  (a) The Company shall take all action necessary, in accordance
         with applicable law and its Certificate of  Incorporation  and By-laws,
         to convene a special  meeting of the  holders of Company  Common  Stock
         (the "Company  Meeting") as promptly as practicable  for the purpose of
         considering and taking action upon this Merger Agreement.  The Board of
         Directors of the Company will  recommend that holders of Company Common
         Stock vote in favor of and approve  the Merger and the  adoption of the
         Merger  Agreement  at the Company  Meeting.  The Company  shall use all
         reasonable efforts to solicit from its stockholders proxies in favor of
         the  adoption of the Merger  Agreement  and shall take all other action
         necessary or  advisable  to secure the vote or consent of  stockholders
         required  by  Delaware  law to obtain  such  approval.  At the  Company
         Meeting,  all of the  shares of  Company  Common  Stock  then  owned by
         Parent,  Sub, or any other  subsidiary  of Parent,  or with  respect to
         which Parent, Sub, or any other subsidiary of Parent holds the power to
         direct the voting, will be voted in favor of approval of the Merger and
         adoption of this Merger Agreement.

                  (b) Parent shall take all action necessary, in accordance with
         applicable law and its  Certificate of  Incorporation  and By-laws,  to
         convene a special  meeting of the holders of Parent  capital stock (the
         "Parent  Meeting")  as  promptly  as  practicable  for the  purpose  of
         considering  and taking  action to  authorize  the  issuance  of Parent
         Common Stock associated with the Merger under the applicable guidelines
         of Nasdaq (the  "Parent  Share  Proposal").  The Board of  Directors of
         Parent will recommend that holders of Parent Common Stock vote in favor
         of and approve the Parent Share Proposal at the Parent Meeting.  Parent
         shall use all  reasonable  efforts  to  solicit  from its  stockholders
         proxies in favor of the adoption of the Parent Share Proposal and shall
         take all other  action  necessary  or  advisable  to secure the vote or
         consent  of  stockholders  required  by  Delaware  law to  obtain  such
         approval.
<PAGE>15
                  Section 3.7.  Closing of the Company's  Transfer Books. At the
Effective  Date,  the stock transfer books of the Company shall be closed and no
transfer  of shares of Company  Common  Stock shall be made  thereafter.  In the
event  that,  after  the  Effective  Date,  Certificates  are  presented  to the
Surviving  Corporation,  they shall be canceled and  exchanged for Parent Common
Stock and/or cash as provided in Sections 3.1(b) and 3.4.

                  Section 3.8. Assistance in Consummation of the Merger. Each of
Parent,  Sub and the Company shall  provide all  reasonable  assistance  to, and
shall cooperate  with, each other to bring about the  consummation of the Merger
as soon as possible in accordance  with the terms and  conditions of this Merger
Agreement.  Parent  shall  cause  Sub  to  perform  all of  its  obligations  in
connection with this Merger Agreement.

                  Section  3.9.   Closing.   The  closing  of  the  transactions
contemplated  by this  Merger  Agreement  shall take place (i) at the offices of
Willkie Farr & Gallagher,  One Citicorp Center,  153 East 53rd Street, New York,
New York 10022,  as soon as  practicable  after the last of the  conditions  set
forth in Article IX is  fulfilled or waived or (ii) at such other time and place
as Parent and the Company shall agree in writing.

                  Section 3.10. No Further Rights in Company  Common Stock.  All
shares of Parent  Common Stock issued upon  conversion  of the shares of Company
Common  Stock in  accordance  with the  terms  hereof  (including  any cash paid
pursuant  to  Sections  3.3 or 3.4) shall be deemed to have been  issued in full
satisfaction of all rights pertaining to such shares of Company Common Stock.

                  Section 3.11.  No Liability.  Neither Parent nor the Company
shall

<PAGE>16


                  be liable to any holder of shares of Company  Common Stock for
any such shares of Company  Common  Stock (or  dividends or  distributions  with
respect  hereto),  or  cash  delivered  to a  public  official  pursuant  to any
abandoned property,  escheat or similar law, rule, regulation,  statute,  order,
judgment or decree.

                  Section   3.12.   Withholding   Rights.   Each  of   Surviving
Corporation  and  Parent  shall be  entitled  to deduct  and  withhold  from the
consideration  otherwise payable pursuant to this Merger Agreement to any holder
of shares of Company  Common  Stock such amounts as it is required to deduct and
withhold  with  respect to the  making of such  payment  under the Code,  or any
provision of state,  local or foreign tax law. To the extent that amounts are so
withheld  by the  Surviving  Corporation  or  Parent,  as the case may be,  such
withheld  amounts shall be treated for all purposes of this Merger  Agreement as
having been paid to the holder of the shares of Company  Common Stock in respect
of which such deduction and withholding was made by the Surviving Corporation or
Parent, as the case may be.

                                   ARTICLE IV.

                    REPRESENTATIONS AND WARRANTIES OF PARENT

                  Parent represents and warrants to the Company as follows:

                  Section  4.1.  Organization  and  Qualification.  Parent  is a
corporation duly organized, validly existing and in good standing under the laws
of the State of Delaware and has the corporate power to carry on its business as
it is now being conducted or currently proposed to be conducted.  Parent is duly
qualified as a foreign corporation to do business,  and is in good standing,  in
each  jurisdiction  where the  character of its  properties  owned or held under
lease or the nature of its activities make such qualification necessary,  except
where the failure to be so qualified will not, individually or in the aggregate,
have a material adverse effect on the business,  properties,  assets,  condition
(financial  or   otherwise),   liabilities  or  operations  of  Parent  and  its
subsidiaries taken as a whole (a "Parent Material Adverse Effect"). Complete and
correct  copies as of the date hereof of the  Certificate of  Incorporation  and
By-laws of Parent have been  delivered  to the  Company as part of a  disclosure
letter  delivered  by Parent  to the  Company  prior to the date of this  Merger
Agreement (the "Parent Disclosure Letter").

                  Section 4.2.  Capitalization.  The authorized capital stock of

<PAGE>17


                  Parent consists of 400,000,000  shares of Parent Common Stock,
and 25,000,000  shares of preferred stock, $.01 par value. As of April 26, 1996,
as adjusted for the Parent Stock Split (i)  125,804,234  shares of Parent Common
Stock were validly issued and outstanding,  fully paid and  nonassessable,  (ii)
95,000 shares of Parent's Series A 8% Cumulative  Convertible  Preferred  Stock,
were validly issued and  outstanding,  fully paid, and  nonassessable  and (iii)
15,000,000  shares of  Series B  Cumulative  Convertible  Preferred  Stock  were
validly issued and outstanding,  fully paid, and  nonassessable.  As of the date
hereof, there are no bonds,  debentures,  notes or other indebtedness having the
right  to vote on any  matters  on  which  the  Parent's  stockholders  may vote
("Parent Voting Debt") issued or outstanding. As of April 26, 1996, after giving
effect to the  Parent  Stock  Split,  except for  options to acquire  20,614,274
shares of Parent Common Stock  pursuant to the Parent's 1992 Stock Plan and 1993
Stock Plan,  warrants  to  purchase  1,500,000  shares of Parent  Common  Stock,
commitments to issue shares of Parent Common Stock under Parent's Shareworks and
Shareworks  Plus programs and commitments to issue shares of Parent Common Stock
to non-employee  directors  pursuant to Parent's 1993 Stock Plan, and, except as
provided herein and in the Parent Rights Plan,  there are no options,  warrants,
calls  or  other  rights,   agreements  or  commitments   presently  outstanding
obligating Parent to issue,  deliver or sell shares of its capital stock or debt
securities, or obligating Parent to grant, extend or enter into any such option,
warrant, call or other such right, agreement or commitment. All of the shares of
Parent  Common  Stock  issuable  in  accordance  with this Merger  Agreement  in
exchange for Company Common Stock at the Effective Date will be, when so issued,
duly  authorized,  validly  issued,  fully paid and  nonassessable  and shall be
delivered  free and clear of any  pledge,  lien,  security  interest,  mortgage,
charge,  claim,  equity,  option,  proxy,  voting  restriction,  right  of first
refusal,  limitation  on  disposition,  adverse  claim  of  ownership  or use or
encumbrance of any kind ("Encumbrances"), including any preemptive rights of any
stockholder of Parent.

                  Section 4.3. Subsidiaries. The only "Significant Subsidiaries"
(as such term is defined in Rule 1-02 of Regulation  S-X of the  Securities  and
Exchange Commission (the "Commission"))  ("Significant  Subsidiaries") of Parent
are those named in Section 4.3 of the Parent  Disclosure  Letter or set forth on
Exhibit 21 to  Parent's  Annual  Report on Form 10-K for the  fiscal  year ended
December 31, 1995. Each Significant Subsidiary incorporated in the United States
is a corporation duly organized, validly existing and in good standing under the
laws of its jurisdiction of  incorporation  and has the corporate power to carry
on its  business  as it is now  being  conducted  or  currently  proposed  to be
conducted.   Each  Significant   Subsidiary  is  duly  qualified  as  a  foreign
corporation

<PAGE>18


                  to do business,  and is in good standing, in each jurisdiction
where the character of its properties owned or held under lease or the nature of
its activities makes such qualification necessary except where the failure to be
so qualified will not have a Parent Material Adverse Effect. Except as disclosed
in Section 4.3 of the Parent Disclosure  Letter,  all the outstanding  shares of
capital stock of each Significant  Subsidiary are validly issued, fully paid and
nonassessable and owned by Parent or by a Significant  Subsidiary of Parent free
and clear of any Encumbrances. There are no existing options, warrants, calls or
other rights,  agreements or commitments of any character relating to the issued
or  unissued  capital  stock  or  other  securities  of any  of the  Significant
Subsidiaries  of Parent.  Except as set forth in the Parent's  Annual  Report on
Form 10-K for the fiscal year ended  December 31, 1995,  as disclosed in Section
4.3 of the Parent  Disclosure  Letter and except for wholly  owned  subsidiaries
which are  formed  after the date  hereof in the  ordinary  course of  business,
Parent  does  not  directly  or  indirectly   own  any  interest  in  any  other
corporation,  partnership, joint venture or other business association or entity
that is a Significant Subsidiary.

                  Section 4.4.  Authority Relative to this Merger Agreement.

                  (a) Parent has the corporate power to execute and deliver this
         Merger  Agreement  and to  carry  out its  obligations  hereunder.  The
         execution and delivery of this Merger Agreement and the consummation of
         the  transactions  contemplated  hereby  have been duly  authorized  by
         Parent's Board of Directors.  The Merger Agreement  constitutes a valid
         and  binding  obligation  of  Parent,  enforceable  against  Parent  in
         accordance  with its  terms,  except as  enforcement  may be limited by
         bankruptcy,  insolvency or other similar laws affecting the enforcement
         of  creditors'  rights  generally and except that the  availability  of
         equitable remedies,  including specific performance,  is subject to the
         discretion  of the court  before which any  proceeding  therefor may be
         brought.  Except for the approval of the holders of the Parent  capital
         stock  described in Section 3.6(b),  no other corporate  proceedings on
         the part of  Parent  are  necessary  to  authorize  the  execution  and
         delivery by Parent of this Merger  Agreement or the consummation of the
         transactions contemplated hereby.

                  (b) The  execution  and delivery of this Merger  Agreement and
         the consummation of the transactions  contemplated hereby, does not and
         will not result in the change in conversion  ratios,  conversion rights
         or voting rights,  or the breach,  violation,  default (with or without
         notice  or  lapse of  time,  or  both),  termination,  cancellation  or
         acceleration of any obligation or the loss of a material benefit, under
         (i) the Parent's charter or by-laws or (ii)

<PAGE>19


                  any  indenture  or  other  loan  document  provision  or other
         contract, license, franchise, permit, order, decree, concession, lease,
         instrument,  judgment,  statute,  law,  ordinance,  rule or  regulation
         applicable  to Parent or any of its  subsidiaries  or their  respective
         properties or assets,  other than, in the case of clause (ii) only, (A)
         any  breaches,  violations,  defaults,   terminations,   cancellations,
         accelerations or losses which, either singly or in the aggregate,  will
         not have a Parent Material  Adverse Effect or prevent the  consummation
         of  the  transactions   contemplated   hereby  and  (B)  the  laws  and
         regulations referred to in the next paragraph.

                  (c)  Except  as   disclosed  in  Section  4.4  of  the  Parent
         Disclosure  Letter,  or in  connection,  or  in  compliance,  with  the
         provisions of the Hart-Scott-Rodino Antitrust Improvements Act of 1976,
         as amended (the "HSR Act"), the Securities Act of 1933, as amended (the
         "Securities  Act"), the Securities  Exchange Act of 1934 (the "Exchange
         Act"), and the corporation,  securities or blue sky laws or regulations
         of  the  various   states,   no  filing  or   registration   with,   or
         authorization,  consent or approval of, any public body or authority is
         necessary  for the  consummation  by Parent of the  Merger or the other
         transactions contemplated by this Merger Agreement, other than filings,
         registrations,  authorizations,  consents or  approvals  the failure of
         which to make or obtain will not have a Parent Material  Adverse Effect
         or prevent the consummation of the transactions contemplated hereby.

                  Section  4.5.  Reports and  Financial  Statements.  Parent has
previously furnished the Company with true and complete copies of its (i) Annual
Report on Form 10-K,  as amended,  for the fiscal years ended  December 31, 1994
and December  31,  1995,  as filed with the  Commission,  (ii) proxy  statements
related to all meetings of its  stockholders  (whether  annual or special) since
January 1, 1994, and (iii) all other reports or registration statements filed by
Parent  with the  Commission  under the  Exchange  Act since  December  31, 1992
through  the date  hereof,  except  Quarterly  Reports  on Form 10-Q for  fiscal
quarters  ended  prior to  December  31,  1995 (the items in clauses (i) through
(iii) being referred to herein collectively as the "Parent SEC Reports").  As of
their respective dates, the Parent SEC Reports complied in all material respects
with the  requirements of the Exchange Act, and the rules and regulations of the
Commission  thereunder  applicable  to such  Parent  SEC  Reports.  As of  their
respective dates, the Parent SEC Reports did not contain any untrue statement of
a material fact or omit to state a material  fact required to be stated  therein
or necessary to make the statements therein, in light of the

<PAGE>20


                  circumstances under which they were made, not misleading.  The
audited  consolidated  financial  statements  and  unaudited  interim  financial
statements of Parent included in the Parent SEC Reports comply as to form in all
material respects with applicable accounting requirements and with the published
rules and  regulations of the  Commission  with respect  thereto.  The financial
statements included in the Parent SEC Reports:  have been prepared in accordance
with generally  accepted  accounting  principles  applied on a consistent  basis
(except as may be indicated therein or in the notes thereto); present fairly, in
all material respects,  the financial position of Parent and its subsidiaries as
at the dates thereof and the results of their  operations and cash flows for the
periods  then ended  subject,  in the case of the  unaudited  interim  financial
statements,  to  normal  year-end  audit  adjustments,   any  other  adjustments
described  therein  and the fact that  certain  information  and notes have been
condensed  or  omitted  in  accordance  with  the  Exchange  Act and  the  rules
promulgated thereunder; and are in all material respects, in accordance with the
books of account and records of Parent.

                  Section 4.6.  Absence of Certain Changes or Events.  Except as
disclosed in the Parent SEC Reports or as disclosed in Section 4.6 of the Parent
Disclosure  Letter,  from  December  31,  1995  through  the date of this Merger
Agreement, there has not been (i) any transaction,  commitment, dispute or other
event or condition  (financial or otherwise) of any character (whether or not in
the  ordinary  course of business)  individually  or in the  aggregate  having a
Parent  Material  Adverse  Effect  (other than as a result of changes in laws or
regulations  of general  applicability);  (ii) any damage,  destruction or loss,
whether or not covered by insurance,  which would have a Parent Material Adverse
Effect; or (iii) any entry into any commitment or transaction material to Parent
and its  subsidiaries  taken  as a whole  (including,  without  limitation,  any
borrowing  or  sale  of  assets)  except  in the  ordinary  course  of  business
consistent with past practice.

                  Section 4.7.  Employee  Benefit Plans.  Except as disclosed in
the Parent SEC Reports or as disclosed  in Section 4.7 of the Parent  Disclosure
Letter, there are no material employee benefit or compensation plans, agreements
or arrangements,  including "employee benefit plans," as defined in Section 3(3)
of the Employee  Retirement  Income Security Act of 1974, as amended  ("ERISA"),
and including, but not limited to, plans, agreements or arrangements relating to
former  employees,  including,  but  not  limited,  to  retiree  medical  plans,
maintained or  contributed to by Parent or any of its  subsidiaries  or material
collective bargaining agreements to which Parent or any of its subsidiaries is a
party,  other than  "multiemployer  plans," as defined in Section 3(37) of ERISA
(together, the "Parent

<PAGE>21


                  Benefit Plans").  To the best knowledge of Parent,  no default
exists  with  respect to the  obligations  of Parent or any of its  subsidiaries
under any Parent Benefit Plan, which default,  alone or in the aggregate,  would
have a Parent Material Adverse Effect. Since January 1, 1995, there have been no
disputes or grievances subject to any grievance procedure, unfair labor practice
proceedings,  arbitration or litigation  under any Parent  Benefit Plans,  which
have not been finally  resolved,  settled or  otherwise  disposed of (other than
claims for  benefits in the  ordinary  course),  nor, to the best  knowledge  of
Parent,  is there any condition  related to any Parent Benefit Plans which, with
notice or lapse of time or both,  which failure to resolve,  settle or otherwise
dispose of, alone or in the aggregate with any other such conditions, would have
a Parent  Material  Adverse  Effect.  Since January 1, 1995,  there have been no
strikes,  lockouts or work  stoppages or slowdowns,  or to the best knowledge of
Parent,  jurisdictional  disputes or organizing activity occurring or threatened
with respect to the business or operations of Parent or its  subsidiaries  which
have had or would have a Parent Material Adverse Effect.

                  Section  4.8.  ERISA.  All  Parent  Benefit  Plans  have  been
administered in accordance, and are in compliance with the applicable provisions
of ERISA,  except where such  failures to  administer or comply would not have a
Parent  Material  Adverse  Effect.  Each of the Parent  Benefit  Plans  which is
intended  to meet  the  requirements  of  Section  401(a)  of the  Code has been
determined by the Internal  Revenue Service (the "IRS") to meet the requirements
of such section of the Code (except with respect to any such benefit plans which
have  not yet been  submitted  to the IRS,  each of  which is still  within  the
"remedial amendment period" described in Section 401(b) of the Code), and Parent
knows of no fact  which is likely  to have an  adverse  affect on the  qualified
status of such plans.  None of the Parent  Benefit Plans are subject to Title IV
of ERISA,  and neither Parent nor any entity  treated as a single  employer with
Parent under Section 414(b) or (c) of the Code (a "Parent ERISA  Affiliate") has
maintained such a plan during the six-year  period ended on the date hereof.  To
the  best  knowledge  of  Parent,  there  are not now nor  have  there  been any
non-exempt "prohibited transactions," as such term is defined in Section 4975 of
the Code or Section 406 of ERISA, involving the Parent Benefit Plans which could
subject Parent or its  subsidiaries  to any penalty or tax imposed under Section
502(i) of ERISA or Section  4975 of the Code other than a de minimis  penalty or
tax.  Neither  Parent nor any  Parent  ERISA  Affiliate  has any  obligation  to
contribute to, or has had within the six-year  period ending on the date hereof,
any  obligation  to or has  actually  contributed  to, any  multiemployer  plan.
Neither Parent nor any ERISA Affiliate has engaged in any transaction  described
in Section

<PAGE>22


                  4069 of ERISA within the five-year period ending on the date
hereof.

                  Section 4.9.  Parent Action.  The Board of Directors of Parent
(at a meeting duly called and held) has by the  unanimous  vote of all directors
present with no  abstentions  (a)  determined  that the Parent Share Proposal is
advisable  and in the best  interests  of Parent  and its  stockholders  and (b)
recommended  the approval of the Parent Share  Proposal by the holders of Parent
Common  Stock and  directed  that the Parent  Share  Proposal be  submitted  for
consideration by Parent's stockholders at the Parent Meeting.

                  Section  4.10.  Fairness  Opinion.  Parent  has  received  the
written opinion of Gleacher NatWest Inc.,  financial advisor to Parent, dated no
later than the date hereof, to the effect that the Exchange Ratio is fair to the
stockholders of Parent from a financial point of view.

                  Section 4.11. No Brokers. Except for Gleacher NatWest Inc., no
broker,  finder or investment  banker is entitled to any brokerage,  finder's or
other fee or  commission  in  connection  with the  Merger  or the  transactions
contemplated  by this Merger  Agreement  based upon  arrangements  made by or on
behalf of Parent.

                  Section 4.12. Parent Ownership of Company Common Stock. Parent
and its  "associates" and "affiliates" (as defined under both Section 203 of the
DGCL and Rule 405 under the Securities Act),  collectively  beneficially own and
have  beneficially  owned at all times during the three-year period prior to the
date  hereof  less than 1% of the shares of  Company  Common  Stock  outstanding
(other than shares of Company Common Stock issuable pursuant to the Stock Option
Agreement to be entered into concurrently herewith).

                                   ARTICLE V.

                  REPRESENTATIONS AND WARRANTIES OF THE COMPANY

                  The  Company  represents  and  warrants  to Parent  and Sub as
follows:

                  Section 5.1. Organization and Qualification.  The Company is a
corporation duly organized, validly existing and in good standing under the laws
of the State of Delaware and has the corporate power to carry on its business as
it is now being conducted or currently proposed to be conducted.  The Company is
duly qualified as a foreign corporation to do business, and is in

<PAGE>23


                  good standing, in each jurisdiction where the character of its
properties  owned or held under lease or the nature of its activities makes such
qualification  necessary,  except where the failure to be so qualified  will not
have a material adverse effect on the business,  properties,  assets,  condition
(financial  or  otherwise),  liabilities  or  operations  of the Company and its
subsidiaries  taken as a whole (a "Company Material Adverse  Effect").  Complete
and correct copies as of the date hereof of the Certificate of Incorporation and
By-laws of the  Company  and each of its  subsidiaries  have been  delivered  to
Parent as part of a disclosure  letter  delivered by the Company to Parent on or
prior to the date of this Merger Agreement (the "Company Disclosure Letter").

                  Section 5.2.  Capitalization.  The authorized capital stock of
the Company  consists of 175,000,000  shares of Company Common Stock and 500,000
shares  of  preferred  stock,  $0.001  par  value.  As of April  26,  1996,  (i)
32,258,139  shares of Company Common Stock were validly issued and  outstanding,
fully paid and  nonassessable  and (ii) no shares of preferred stock were issued
and outstanding. As of the date hereof, there are no bonds, debentures, notes or
other  indebtedness  having  the  right  to vote on any  matters  on  which  the
Company's  stockholders  may vote ("Voting Debt") issued or  outstanding.  As of
April 26, 1996,  except for (i) options to acquire  3,232,015  shares of Company
Common Stock (the  "Options"),  (ii)  options  outstanding  under the  Company's
Employee Stock  Purchase Plan, and (iii) the issuance of shares  pursuant to the
proposed transactions  described in Section 5.2 of the Company Disclosure Letter
(the "Proposed  Transactions"),  there are no options,  warrants, calls or other
rights,  agreements or commitments presently outstanding  obligating the Company
to issue,  deliver or sell shares of its capital  stock or debt  securities,  or
obligating the Company to grant, extend or enter into any such option,  warrant,
call or other such right, agreement or commitment.

                  Section 5.3. Subsidiaries.  The only Significant  Subsidiaries
of the Company are  disclosed in Section 5.3 of the Company  Disclosure  Letter,
all of which  have  been  named  in the  Company  SEC  Reports  (as  hereinafter
defined).  Each Significant Subsidiary is a corporation duly organized,  validly
existing  and  in  good  standing  under  the  laws  of  its   jurisdiction   of
incorporation  and has the corporate power to carry on its business as it is now
being  conducted  or  currently  proposed  to  be  conducted.  Each  Significant
Subsidiary  incorporated  in the United  States is duly  qualified  as a foreign
corporation to do business,  and is in good standing, in each jurisdiction where
the character of its properties owned or held under lease or the

<PAGE>24


                  nature of its activities  makes such  qualification  necessary
except  where the failure to be so  qualified  will not have a Company  Material
Adverse Effect.  All the outstanding shares of capital stock of each Significant
Subsidiary are validly  issued,  fully paid and  nonassessable  and owned by the
Company or by a subsidiary  of the Company  free and clear of any  Encumbrances.
There are no existing options,  warrants,  calls or other rights,  agreements or
commitments of any character relating to the issued or unissued capital stock or
other securities of any of the Significant  Subsidiaries of the Company.  Except
as set forth in the  Company's  Annual  Report on Form 10-K for the fiscal  year
ended  December 31, 1995, as disclosed in Section 5.3 of the Company  Disclosure
Letter and except for wholly owned  subsidiaries which are formed after the date
hereof in the  ordinary  course of  business,  the Company  does not directly or
indirectly own any interest in any other corporation, partnership, joint venture
or other business association or entity.

                  Section 5.4.  Authority Relative to this Merger Agreement.

                  (a) The Company has the corporate power to execute and deliver
         this Merger  Agreement and to carry out its obligations  hereunder and,
         subject to  approval  of the  Merger  Agreement  by the  holders of the
         Company  Common  Stock,  to carry out its  obligations  hereunder.  The
         execution and delivery of this Merger Agreement and the consummation of
         the transactions  contemplated  hereby have been duly authorized by the
         Company's Board of Directors. This Merger Agreement constitutes a valid
         and binding obligation of the Company,  enforceable against the Company
         in accordance  with its terms,  except as enforcement may be limited by
         bankruptcy,  insolvency or other similar laws affecting the enforcement
         of  creditors'  rights  generally and except that the  availability  of
         equitable remedies,  including specific performance,  is subject to the
         discretion  of the court  before which any  proceeding  therefor may be
         brought.

                  (b)  Except  as  disclosed  in  Section  5.4  of  the  Company
         Disclosure  Letter, the execution and delivery of this Merger Agreement
         and the consummation of the transactions  contemplated hereby, does not
         and will not result in the breach, violation,  default (with or without
         notice  or  lapse of  time,  or  both),  termination,  cancellation  or
         acceleration of any obligation or the loss of a material benefit, under
         (i) the  Company's  charter or by-laws or (ii) any  indenture  or other
         loan document provision or other contract, license, franchise,  permit,
         order, decree, concession,  lease, instrument,  judgment, statute, law,
         ordinance,  rule or regulation  applicable to the Company or any of its
         subsidiaries or their respective properties or assets, other

<PAGE>25


                  than,  in the case of  clause  (ii)  only,  (A) any  breaches,
         violations,  defaults,  terminations,  cancellations,  accelerations or
         losses  which,  either  singly  or in the  aggregate,  will  not have a
         Company  Material  Adverse  Effect or prevent the  consummation  of the
         transactions  contemplated  hereby  and (B) the  laws  and  regulations
         referred to in the next paragraph. Contemporaneously with the execution
         and delivery of this Merger Agreement, Microsoft Corporation ("MS") has
         delivered  a  written  waiver of any (i) MS right of first  refusal  or
         first offer  contained  in that certain  TCP/IP  Local  Access  Network
         Agreement, dated as of March 6, 1995, by and between MS and the Company
         (the  "MS  Agreement"),  (ii) any MS  right  of  termination  of the MS
         Agreement,  in each case as a result of the  execution  and delivery of
         this  Merger   Agreement  and  the  consummation  of  the  transactions
         contemplated  hereby, (iii) any MS right to declare a default under the
         Equipment Loan Agreement dated as of March 6, 1996,  between MS and the
         Company as a result of the  exercise  of the rights  granted  under the
         Stock  Option   Agreement  or  the  consummation  of  the  transactions
         contemplated hereby and (iv) any MS right to have representation on the
         Company's Board of Directors.  In addition,  contemporaneously with the
         execution  and  delivery of this Merger  Agreement,  Microsoft  Network
         L.L.C.  has delivered a written  waiver of any right of  termination of
         the TCP/IP Network Access Provider Agreement, dated April 9, 1996, as a
         result of the execution  and delivery of this Merger  Agreement and the
         consummation of the transactions contemplated hereby.

                  (c)  Except  as  disclosed  in  Section  5.4  of  the  Company
         Disclosure Letter or transactions  contemplated  thereby in connection,
         or in  compliance,  with the  provisions of the HSR Act, the Securities
         Act, the Exchange Act, and the corporation, securities or blue sky laws
         or regulations of the various states,  no filing or registration  with,
         or authorization,  consent or approval of, any public body or authority
         is necessary for the  consummation  by the Company of the Merger or the
         other   transactions   contemplated   hereby,   other   than   filings,
         registrations,  authorizations,  consents or  approvals  the failure of
         which to make or obtain will not have a Company Material Adverse Effect
         or prevent the consummation of the transactions contemplated hereby.

                  Section 5.5. Reports and Financial Statements. The Company has
previously  furnished  Parent  with true and  complete  copies of its (i) Annual
Report on Form 10-K, as amended, for the fiscal year ended December 31, 1995, as
filed with the Commission,  (ii) proxy statements related to all meetings of its
stockholders  (whether  annual or special)  since January 1, 1995, and (iii) all
other  reports  or  registration  statements  filed  by  the  Company  with  the
Commission under the

<PAGE>26


                  Exchange Act since December 31, 1994, except Quarterly Reports
on Form 10-Q for fiscal  quarters ended prior to December 31, 1995 (the items in
clauses (i) through (iii) being referred to herein  collectively as the "Company
SEC Reports"). As of their respective dates, the Company SEC Reports complied in
all material  respects with the  requirements  of the Exchange Act and the rules
and  regulations  of the  Commission  thereunder  applicable to such Company SEC
Reports.  As of their respective  dates, the Company SEC Reports did not contain
any  untrue  statement  of a  material  fact or omit to  state a  material  fact
required to be stated  therein or necessary to make the statements  therein,  in
light of the  circumstances  under  which they were made,  not  misleading.  The
audited  consolidated  financial  statements  and  unaudited  interim  financial
statements of the Company  included in the Company SEC Reports comply as to form
in all material  respects with applicable  accounting  requirements and with the
published  rules and  regulations of the Commission  with respect  thereto.  The
financial statements included in the Company SEC Reports:  have been prepared in
accordance with generally accepted accounting principles applied on a consistent
basis  (except as may be  indicated  therein or in the notes  thereto);  present
fairly, in all material respects,  the financial position of the Company and its
subsidiaries  as at the dates  thereof and the results of their  operations  and
cash flow for the  periods  then  ended  subject,  in the case of the  unaudited
interim financial statements, to normal year-end audit adjustments and any other
adjustments  described  therein and the fact that certain  information and notes
have been condensed or omitted in accordance with the Exchange Act and the rules
promulgated thereunder; and are in all material respects, in accordance with the
books of account and records of the Company.

                  Section 5.6.  Absence of Certain Changes or Events.  Except as
disclosed  in the  Company  SEC  Reports or as  disclosed  in Section 5.6 of the
Company  Disclosure  Letter,  from  December  31, 1995  through the date of this
Merger Agreement, there has not been (i) any transaction, commitment, dispute or
other event or condition  (financial or otherwise) of any character  (whether or
not in the ordinary course of business)  individually or in the aggregate having
a Company  Material Adverse Effect (other than as a result of changes in laws or
regulations  of general  applicability);  (ii) any damage,  destruction or loss,
whether or not covered by insurance, which would have a Company Material Adverse
Effect;  or (iii) any entry into any commitment or  transaction  material to the
Company and its subsidiaries  taken as a whole (including,  without  limitation,
any  borrowing  or sale of assets)  except in the  ordinary  course of  business
consistent with past practice.

                  Section 5.7.  Employee Benefit Plans.  Except as disclosed in
the Company SEC Reports or as disclosed in Section 5.7 of the

<PAGE>27


                  Company  Disclosure  Letter,  there are no  material  employee
benefit or compensation plans,  agreements or arrangements,  including "employee
benefit  plans," as defined in Section  3(3) of ERISA,  and  including,  but not
limited to, plans,  agreements  or  arrangements  relating to former  employees,
including,  but not limited, to retiree medical plans, maintained or contributed
to by the Company or any of its subsidiaries or material  collective  bargaining
agreements  to which the Company or any of its  subsidiaries  is a party,  other
than "multiemployer plans," as defined in Section 3(37) of ERISA (together,  the
"Company  Benefit  Plans").  To the best  knowledge of the  Company,  no default
exists with respect to the obligations of the Company or any of its subsidiaries
under any Company Benefit Plan, which default, alone or in the aggregate,  would
have a Company Material  Adverse Effect.  Since January 1, 1995, there have been
no disputes or  grievances  subject to any  grievance  procedure,  unfair  labor
practice proceedings, arbitration or litigation under any Company Benefit Plans,
which have not been finally  resolved,  settled or otherwise  disposed of (other
than claims for benefits in the ordinary course),  nor, to the best knowledge of
the Company,  is there any condition related to any Company Benefit Plans which,
with  notice  or lapse of time or both,  which  failure  to  resolve,  settle or
otherwise  dispose of, alone or in the aggregate with any other such conditions,
would have a Company Material Adverse Effect.  Since January 1, 1995, there have
been no  strikes,  lockouts  or work  stoppages  or  slowdowns,  or to the  best
knowledge  of  the  Company,  jurisdictional  disputes  or  organizing  activity
occurring  or  threatened  with  respect to the  business or  operations  of the
Company or its  subsidiaries  which  have had or would  have a Company  Material
Adverse Effect.

                  Section  5.8.  ERISA.  All  Company  Benefit  Plans  have been
administered in accordance, and are in compliance with the applicable provisions
of ERISA,  except where such  failures to  administer or comply would not have a
Company  Material  Adverse  Effect.  Each of the Company  Benefit Plans which is
intended  to meet  the  requirements  of  Section  401(a)  of the  Code has been
determined  by the IRS to meet  the  requirements  of such  section  of the Code
(except with respect to any such benefit plans which have not yet been submitted
to the IRS,  each of  which is still  within  the  "remedial  amendment  period"
described in Section 401(b) of the Code), and the Company knows of no fact which
is likely to have an adverse affect on the qualified status of such plans.  None
of the Company  Benefit Plans are subject to Title IV of ERISA,  and neither the
Company nor any entity  treated as a single  employer with Company under Section
414(b) or (c) of the Code (a "Company ERISA  Affiliate")  has maintained  such a
plan during the six-year period ended on the date hereof.  To the best knowledge
of the Company, there are not now nor have there been any non-exempt "prohibited
transactions," as such term

<PAGE>28


                  is  defined  in  Section  4975 of the Code or  Section  406 of
ERISA,  involving  the Company  Benefit Plans which could subject the Company or
its  subsidiaries to any penalty or tax imposed under Section 502(i) of ERISA or
Section  4975 of the Code other than a de minimis  penalty or tax.  Neither  the
Company nor any Company ERISA  Affiliate has any obligation to contribute to, or
has had within the six-year period ending on the date hereof,  any obligation to
or has actually  contributed to, any multiemployer plan. Neither the Company nor
any Company ERISA Affiliate has engaged in any transaction  described in Section
4069 of ERISA within the five-year period ending on the date hereof.

                  Section 5.9. Takeover  Provisions  Inapplicable.  Assuming the
accuracy of the  representation  of Parent set forth in Section  4.12, as of the
date hereof and at all times on or prior to the Effective  Date,  Section 203 of
the DGCL is,  and shall be,  inapplicable  to the  Merger  and the  transactions
contemplated  by this  Merger  Agreement,  the  approval  of the  execution  and
delivery of the Stock Option Agreement.

                  Section 5.10.  Company  Action.  The Board of Directors of the
Company  (at a meeting  duly called and held) has by the  unanimous  vote of all
directors  present  with no  abstentions  (a)  determined  that  the  Merger  is
advisable  and  fair  and  in  the  best   interests  of  the  Company  and  its
stockholders,  (b)  approved the Merger in  accordance  with the  provisions  of
Section 251 of the DGCL, (c) recommended  the approval of this Merger  Agreement
and the Merger by the holders of the Company  Common Stock and directed that the
Merger be submitted  for  consideration  by the  Company's  stockholders  at the
Company Meeting, (d) taken all necessary steps to render Section 203 of the DGCL
inapplicable  to the Merger and the  transactions  contemplated  by this  Merger
Agreement  (assuming the accuracy of the  representation  of Parent set forth in
Section  4.12),  and (e) adopted a  resolution  having the effect of causing the
Company not to be subject,  to the extent  permitted by  applicable  law, to any
state  takeover  law that may  purport  to be  applicable  to the Merger and the
transactions contemplated by this Merger Agreement.

                  Section 5.11.  Fairness Opinion.  The Company has received the
written opinion of Goldman,  Sachs & Co., financial advisor to the Company dated
no later than the date hereof,  to the effect that the Exchange Ratio is fair to
the stockholders of the Company.

                  Section 5.12.  No Brokers.  (i) Except as set forth in
Section 5.12 of the Company Disclosure Letter and for Goldman, Sachs & Co., no
broker, finder or investment banker is entitled to any brokerage, finder's or
other fee or commission in connection with the Merger

<PAGE>29


                  or the  transactions  contemplated  by this  Merger  Agreement
based upon arrangements  made by or on behalf of the Company,  and (ii) the fees
and commissions payable as contemplated by this Section 5.12.

                                   ARTICLE VI.

                  REPRESENTATIONS AND WARRANTIES REGARDING SUB

                  Parent and Sub jointly and severally  represent and warrant to
the Company as follows:

                  Section  6.1.   Organization.   Sub  is  a  corporation   duly
organized,  validly existing and in good standing under the laws of the State of
Delaware.  Sub was  incorporated  on March 27,  1996.  Except as  related to the
Merger,   this  Merger  Agreement  and  the  consummation  of  the  transactions
contemplated  hereby,  Sub has not engaged in any business or activities  (other
than certain organizational  matters) or incurred any commitments or liabilities
since it was incorporated.

                  Section 6.2.  Capitalization.  The authorized capital stock of
Sub consists of 1,000  shares of Common  Stock,  par value $0.01 per share,  100
shares of which are validly issued and outstanding, fully paid and nonassessable
and,  except as disclosed in Section 6.2 of the Parent  Disclosure  Letter,  are
owned by Parent free and clear of all Encumbrances.

                  Section 6.3. Authority Relative to this Merger Agreement.  Sub
has the corporate power to enter into this Merger Agreement and to carry out its
obligations  hereunder.  The execution and delivery of this Merger Agreement and
the  consummation  of  the  transactions  contemplated  hereby  have  been  duly
authorized  by its  Board  of  Directors  and  sole  stockholder,  and no  other
corporate  proceedings on the part of Sub are necessary to authorize this Merger
Agreement and the transactions contemplated hereby. Except as referred to herein
or in  connection,  or in  compliance,  with the  provisions of the HSR Act, the
Securities  Act, the Exchange Act and the  corporation,  securities  or blue sky
laws or regulations of the various states,  no filing or  registration  with, or
authorization,  consent or approval of, any Governmental Entity is necessary for
the consummation by Sub of the Merger or the  transactions  contemplated by this
Merger Agreement, other than filings, registrations, authorizations, consents or
approvals  the failure to make or obtain would not prevent the  consummation  of
the transactions contemplated hereby.



<PAGE>30


                                  ARTICLE VII.

                     CONDUCT OF BUSINESS PENDING THE MERGER

                  Section 7.1.  Conduct of Business by the Company Pending the
Merger.  Prior to the Effective Date, unless Parent shall otherwise agree in
writing:

                  (a) the Company shall,  and shall cause its  subsidiaries  to,
         carry on their respective businesses in the usual, regular and ordinary
         course in substantially  the same manner as heretofore  conducted,  and
         shall, and shall cause its subsidiaries to, use all reasonable  efforts
         to preserve intact their present business organizations, keep available
         the services of their present officers and employees and preserve their
         relationships  with  customers,  suppliers and others  having  business
         dealings  with  them  to the  end  that  their  goodwill  and  on-going
         businesses  shall be  unimpaired  at the  Effective  Date,  except such
         impairment as would not have a Company  Material  Adverse  Effect.  The
         Company  shall,  and shall  cause its  subsidiaries  to,  (a)  maintain
         insurance  coverages  and its books,  accounts and records in the usual
         manner  consistent  with prior  practices;  (b) comply in all  material
         respects with all laws,  ordinances  and  regulations  of  Governmental
         Entities  applicable to the Company and its subsidiaries;  (c) maintain
         and keep its properties and equipment in good repair, working order and
         condition,  ordinary  wear and tear  excepted;  and (d)  perform in all
         material  respects its obligations  under all contracts and commitments
         to which it is a party or by which it is bound, in each case other than
         where  the  failure  to  so   maintain,   comply  or  perform,   either
         individually  or in the aggregate,  would result in a Company  Material
         Adverse Effect;

                  (b) except as required by this  Merger  Agreement  the Company
         shall not and shall not  propose to (A) sell or pledge or agree to sell
         or pledge any capital stock owned by it in any of its subsidiaries, (B)
         amend its Certificate of Incorporation or By-laws,  (C) split,  combine
         or reclassify its outstanding  capital stock, or declare,  set aside or
         pay any  dividend  or other  distribution  payable  in  cash,  stock or
         property,  or (D) directly or indirectly redeem,  purchase or otherwise
         acquire or agree to redeem, purchase or otherwise acquire any shares of
         capital  stock of the  Company  except  for the  repurchase  at cost of
         shares of Company Common Stock from employees, consultants or directors
         of the Company upon termination of their  relationship with the Company
         in accordance with existing  contractual  rights of repurchase in favor
         of the Company;

                  (c)  the Company shall not, nor shall it permit any of its
         subsidiaries to, (A) except as required by this Merger

<PAGE>31


                  Agreement,  issue,  propose to issue, deliver or sell or agree
         to issue,  deliver or sell any  additional  shares of, or rights of any
         kind to acquire  any shares of,  its  capital  stock of any class,  any
         option, rights or warrants to acquire, or securities  convertible into,
         shares of capital  stock  other than  issuances  of options to purchase
         Company  Common Stock under the Stock Option Plans on or after the date
         of  this  Merger   Agreement   to  employees  of  the  Company  or  its
         subsidiaries (including subsidiaries acquired or formed on or after the
         date of this Merger  Agreement) in the ordinary  course of business and
         consistent  with past  practice,  other than to such  employees who are
         executive officers of the Company ("Permitted Options") or issuances of
         Company Common Stock pursuant to the Proposed  Transactions,  the Stock
         Purchase  Plan or the  exercise of options  outstanding  on the date of
         this Merger  Agreement or  Permitted  Options;  (B)  acquire,  lease or
         dispose or agree to acquire,  lease or dispose of any capital assets or
         any other assets  other than (i) in the ordinary  course of business or
         (ii) in  connection  with any  additional  deployment  or  expansion of
         network   infrastructure   requested   by  MS;  (C)  incur   additional
         Indebtedness  or encumber or grant a security  interest in any asset or
         enter into any other material  transaction  other than in each case (i)
         in the ordinary  course of business,  (ii) pursuant to any extension of
         credit by MS, or (iii)  pursuant to credit  facilities  in an aggregate
         amount not to exceed  $40,000,000;  (D)  acquire or agree to acquire by
         merging or  consolidating  with, or by purchasing a substantial  equity
         interest in, or by any other manner,  any business or any  corporation,
         partnership,  association  or other business  organization  or division
         thereof,   in  each  case  in  this  Clause  (D)  which  are  material,
         individually or in the aggregate,  to the Company and its  subsidiaries
         taken as a whole,  except  that the  Company  may acquire or create new
         wholly owned  subsidiaries  in the  ordinary  course of business and as
         contemplated  by the Proposed  Transactions;  (E) authorize any capital
         expenditures in excess of the Company's 1996 capital expenditure budget
         provided  to  Parent  prior  to the date  hereof,  except  for  capital
         expenditures funded by an increase in credit facilities with MS; or (F)
         enter into any  contract,  agreement,  commitment or  arrangement  with
         respect to any of the foregoing;

                  (d) except as disclosed in the Company  Disclosure Letter, the
         Company  shall not, nor shall it permit,  any of its  subsidiaries  to,
         except as required to comply with applicable law and except as provided
         in Section 3.5 hereof,  (A) adopt,  enter into,  terminate or amend any
         bonus,  profit sharing,  compensation,  severance,  termination,  stock
         option, pension, retirement, deferred compensation, employment or other
         Company Benefit Plan,  agreement,  trust, fund or other arrangement for
         the benefit or welfare of any director,

<PAGE>32


                  officer  or  current  or former  employee,  other  than in the
         ordinary course of business  consistent with past practice (B) increase
         in any  manner the  compensation  or fringe  benefit  of any  director,
         officer or employee (except for normal increases in the ordinary course
         of business  that are  consistent  with past  practice and that, in the
         aggregate,  do  not  result  in a  material  increase  in  benefits  or
         compensation  expense to the Company and its  subsidiaries  relative to
         the level in effect prior to such  amendment  and except for  increases
         pursuant to the Company's pending 1996 salary increases in an aggregate
         amount not to exceed 15% of the base salary of current  employees,  (C)
         pay any benefit not provided  under any existing  plan or  arrangement,
         (D) grant any awards under any bonus,  incentive,  performance or other
         compensation  plan or arrangement or Company  Benefit Plan  (including,
         without  limitation,  the grant of stock  options,  stock  appreciation
         rights,  stock  based or stock  related  awards,  performance  units or
         restricted  stock,  or the  removal  of  existing  restrictions  in any
         benefit plans or agreements or awards made thereunder) (other than such
         plans and arrangements (other than stock options) which are made in the
         ordinary course of business  consistent  with past practice,  including
         Permitted  Options),  (E) take any  action  to fund or in any other way
         secure the payment of compensation or benefits under any employee plan,
         agreement,  contract or arrangement or Company  Benefit Plan other than
         in the ordinary course of business  consistent  with past practice,  or
         (F) adopt,  enter into,  amend or terminate  any  contract,  agreement,
         commitment or arrangement to do any of the foregoing;

                  (e)  except as set  forth on  Section  7.1(e)  of the  Company
         Disclosure  Letter,  the Company  shall not, nor shall it permit any of
         its  subsidiaries  to, make any  investments  in  non-investment  grade
         securities exceeding  $1,000,000;  provided,  however, that the Company
         will be  permitted  to create  new  wholly  owned  subsidiaries  in the
         ordinary course of business or pursuant to the Proposed Transactions.

                  (f) the  Company  shall  not,  nor shall it permit  any of its
         subsidiaries  to,  take or cause to be taken any action  (other than in
         the ordinary course of business  consistent with past practices),  with
         respect  to  accounting  policies  or  procedures  (including,  without
         limitation,  procedures with respect to the payment of accounts payable
         and collection of accounts receivable);

                  (g) the  Company  shall  prepare  and  file  all  tax  returns
         required to be filed with  respect to the Company and its  subsidiaries
         (or any of them)  after  the date of this  Merger  Agreement  and on or
         before  the  Effective  Date  in a  timely  manner,  and  in  a  manner
         consistent with prior years and applicable  laws and regulations  other
         than such tax returns

<PAGE>33


                  for which the failure to file would not have a Company
         Material Adverse Effect; and

                  (h) the  Company  shall file with the  Commission  all reports
         required  to be filed  under the  Exchange  Act on or prior to the date
         each  such  report  is due and all such  reports  shall  comply  in all
         material  respects with the  requirements  of the Exchange Act, and the
         rules and regulations of the Commission  thereunder  applicable to such
         reports and, upon such filing,  shall not contain any untrue  statement
         of a material  fact or omit to state a  material  fact  required  to be
         stated therein or necessary to make the statements therein, in light of
         the  circumstances  under  which they were made,  not  misleading.  The
         unaudited interim financial  statements of the Company included in such
         reports  shall  comply  as  to  form  in  all  material  respects  with
         applicable  accounting  requirements  and with the published  rules and
         regulations  of the  Commission  with  respect  thereto  and  shall  be
         prepared in accordance with generally  accepted  accounting  principles
         applied on a consistent basis (except as may be indicated therein or in
         the notes thereto), shall present fairly, in all material respects, the
         financial  position of the Company and its subsidiaries as at the dates
         thereof  and the  results  of their  operations  and cash flows for the
         periods then ended subject to normal  year-end audit  adjustments,  any
         other   adjustments   described  therein  and  the  fact  that  certain
         information  and notes shall be condensed or omitted in accordance with
         the Exchange Act and the rules and regulations  promulgated thereunder,
         and shall be in all material respects,  in accordance with the books of
         account and records of the Company.

                  Section 7.2. Conduct of Business by Parent Pending the Merger.
Prior to the Effective Date, unless the Company shall otherwise agree in writing
or except as otherwise  required by this Merger  Agreement,  Parent  shall,  and
shall cause its  subsidiaries  to, carry on their  respective  businesses in the
usual,  regular  and  ordinary  course  in  substantially  the  same  manner  as
heretofore  conducted,  and shall,  and shall cause its subsidiaries to, use all
reasonable efforts to preserve intact their present business organizations, keep
available  the services of their  present  officers and  employees  and preserve
their  relationships  with  customers,  suppliers  and  others  having  business
dealings with them to the end that their goodwill and on-going  businesses shall
be  unimpaired  at the Effective  Date.  From the date of this Merger  Agreement
through the Effective Date. From the date of this Merger  Agreement  through the
Effective  Date,  Parent  shall  not pay or  declare  any  dividend  or make any
distribution  with  respect to the Parent  Common  Stock,  other than the events
contemplated by Section 3.1(c).



<PAGE>34


                  Section  7.3.  Conduct of Business  of Sub.  During the period
from the date of this Merger  Agreement  to the  Effective  Date,  Sub shall not
engage in any activities of any nature except as provided in or  contemplated by
this Merger Agreement.

                  Section 7.4. Notice of Breach.  Each party shall promptly give
written  notice to the other party upon becoming  aware of the occurrence or, to
its best knowledge, impending or threatened occurrence, of any event which would
cause  or  constitute  a breach  of any of its  representations,  warranties  or
covenants  contained or  referenced  in this Merger  Agreement  and will use all
reasonable efforts to prevent or promptly remedy the same. Any such notification
shall not be deemed an amendment of the Company  Disclosure Letter or the Parent
Disclosure Letter.

                                  ARTICLE VIII.

                              ADDITIONAL AGREEMENTS

                  Section 8.1. Access and  Information.  Each of the Company and
Parent and their  respective  subsidiaries  shall afford to the other and to the
other's accountants, counsel and other representatives full access during normal
business hours after  reasonable  notice (and at such other times as the parties
may mutually agree)  throughout the period prior to the Effective Date to all of
its properties, books, contracts, commitments, records and personnel and, during
such period, each shall furnish promptly to the other (i) a copy of each report,
schedule and other document filed or received by it pursuant to the requirements
of Federal or state securities laws, and (ii) all other  information  concerning
its business, properties and personnel as the other may reasonably request. Each
of the Company and Parent shall hold, and shall cause their respective employees
and agents to hold, in confidence all such  information  in accordance  with the
terms of the  Confidentiality  Agreement  dated March 5, 1996 between Parent and
the Company.

                  Section 8.2. Registration  Statement/Proxy  Statement.  Parent
and the Company shall cooperate and promptly  prepare and Parent shall file with
the Commission as soon as practicable a Registration  Statement of Form S-4 (the
"Form S-4") under the  Securities  Act,  with respect to the Parent Common Stock
issuable in the Merger,  a portion of which  Registration  Statement  shall also
serve as the joint proxy  statement with respect to the Company  Meeting and the
Parent Meeting (the "Proxy  Statement/Prospectus").  The respective parties will
cause the Proxy Statement/Prospectus and the Form S-4 to comply as to form

<PAGE>35


                  in all material respects with the applicable provisions of the
Securities  Act,  the  Exchange  Act and the rules and  regulations  thereunder.
Parent shall use all  reasonable  efforts,  and the Company will  cooperate with
Parent, to have the Form S-4 declared effective by the Commission as promptly as
practicable  and to keep the  Form  S-4  effective  as long as is  necessary  to
consummate the Merger. Parent shall, as promptly as practicable,  provide copies
of any written  comments  received from the Commission  with respect to the Form
S-4 to the Company and advise the Company of any verbal comments with respect to
the Form S-4 received from the Commission.  Parent shall use its best efforts to
obtain,  prior  to the  effective  date of the Form  S-4,  all  necessary  state
securities  law or "Blue Sky"  permits or  approvals  required  to carry out the
transactions  contemplated  by the Merger  Agreement  and will pay all  expenses
incident  thereto.  Parent agrees that the Proxy  Statement/Prospectus  and each
amendment or supplement  thereto at the time of mailing  thereof and at the time
of the Company Meeting and the Parent  Meeting,  or, in the case of the Form S-4
and each  amendment or  supplement  thereto,  at the time it is filed or becomes
effective,  will not include an untrue  statement of a material  fact or omit to
state a material  fact  required to be stated  therein or  necessary to make the
statements  therein,  in light of the circumstances  under which they were made,
not  misleading;  provided,  however,  that the foregoing shall not apply to the
extent that any such untrue  statement of a material fact or omission to state a
material fact was made by Parent in reliance upon and in conformity with written
information   concerning  the  Company   furnished  to  Parent  by  the  Company
specifically for use in the Proxy Statement/Prospectus.  The Company agrees that
the written  information  concerning the Company provided by it for inclusion in
the Proxy  Statement/Prospectus and each amendment or supplement thereto, at the
time of mailing  thereof and at the time of the  Company  Meeting and the Parent
Meeting, or, in the case of written information  concerning the Company provided
by the Company for  inclusion  in the Form S-4 or any  amendment  or  supplement
thereto,  at the time it is filed or  becomes  effective,  will not  include  an
untrue statement of a material fact or omit to state a material fact required to
be stated therein or necessary to make the statements  therein,  in light of the
circumstances  under  which they were made,  not  misleading.  No  amendment  or
supplement  to the  Proxy  Statement/Prospectus  will be made by  Parent  or the
Company without the approval of the other party. Parent will advise the Company,
promptly  after it receives  notice  thereof,  of the time when the Form S-4 has
become  effective or any supplement or amendment has been filed, the issuance of
any stop order,  the  suspension  of the  qualification  of Parent  Common Stock
issuable in connection with the Merger for offering or sale in any jurisdiction,
or any request by the Commission for amendment of the Proxy Statement/Prospectus
or the Form S-4 or  comments  thereon and  responses  thereto or requests by the
Commission for additional information. At the effective date of the registration
statement on Form S-4, all of the Parent Common

<PAGE>36


                  Stock to be  issued in the  Merger  shall be  covered  by such
registration statement.

                  Section 8.3.  Compliance  with the Securities Act. At least 30
days prior to the Closing  Date,  the Company  shall deliver to Parent a list of
names and  addresses  of those  persons who were,  in the  Company's  reasonable
judgment,  at the record date for the Company Meeting,  "affiliates"  (each such
person,  an  "Affiliate")  of the Company  within the meaning of Rule 145 of the
rules and  regulations  promulgated  under the Securities Act. The Company shall
use all reasonable efforts to deliver or cause to be delivered to Parent,  prior
to the Effective Date, from each of the Affiliates of the Company  identified in
the foregoing  list, an Affiliate  Letter in the form attached hereto as Exhibit
8.3.  Parent shall be entitled to place  legends as specified in such  Affiliate
Letters on the  certificates  evidencing  any Parent  Company Common Stock to be
received by such Affiliates  pursuant to the terms of the Merger Agreement,  and
to issue  appropriate  stop transfer  instructions to the transfer agent for the
Parent  Company  Common  Stock,  consistent  with the  terms  of such  Affiliate
Letters.

                  Section 8.4.  Listing.  Parent shall use its best efforts to
include on Nasdaq, upon official notice of issuance, the Parent Common Stock to
be issued pursuant to the Merger.

                  Section 8.5.  Indemnification.

                  (a) The By-laws and the  Certificate of  Incorporation  of the
         Surviving  Corporation  shall be amended prior to the Effective Date to
         contain  provisions  identical with respect to indemnification to those
         set forth in the By-laws and the  Certificate of  Incorporation  of the
         Company  as in  effect  on the  date of this  Merger  Agreement,  which
         provisions of the By-laws and the Certificate of  Incorporation  of the
         Surviving  Corporation  shall not be  amended,  repealed  or  otherwise
         modified  for a period of six years  after  the  Effective  Date in any
         manner that would adversely affect the rights thereunder of individuals
         who immediately  prior to the Effective Date were directors,  officers,
         agents  or  employees  of  the  Company.   Parent  and  the   Surviving
         Corporation  shall  jointly and  severally  indemnify,  defend and hold
         harmless the directors,  officers and agents of the Company as provided
         in   the   Company's   Certificate   of   Incorporation,   By-Laws   or
         indemnification  agreements,  as in effect as of the date hereof,  with
         respect to matters  occurring through the Effective Date. Parent agrees
         to cause Surviving  Corporation to maintain in effect for not less than
         three years after the Effective Date the current

<PAGE>37


                  policies  of  directors'  and  officers'  liability  insurance
         maintained  by the Company with respect to matters  occurring  prior to
         the  Effective  Date;  provided,   however,   that  (i)  the  Surviving
         Corporation  may  substitute  therefor  policies  of at least  the same
         coverage (with carriers  comparable to the Company's existing carriers)
         containing terms and conditions  which are no less  advantageous to the
         officers, directors and employees of the Company and (ii) the Surviving
         Corporation  shall not be  required  to pay an annual  premium for such
         insurance  in excess of three times the last annual  premium paid prior
         to the date hereof, but in such case shall purchase as much coverage as
         possible for such amount.

                  (b) The  Company's  Board  of  Directors  has  consulted  with
         financial and legal advisors in connection with the execution, delivery
         and  performance  by the  Company  of  this  Merger  Agreement  and the
         approval  for  purposes  of Section 203 of the DGCL,  the  transactions
         contemplated by the execution and delivery of a Stock Option  Agreement
         by certain  members of the Company's Board of Directors or an affiliate
         or employer of certain members of the Company's Board of Directors, and
         the  Company's  Board of  Directors  believes  that the  members of the
         Company's Board of Directors have complied with their fiduciary  duties
         under  Delaware  law and  that  there  is no  pending  or,  to the best
         knowledge of the Company, threatened suit, action or proceeding against
         the Company or any member of the Company's Board of Directors asserting
         a claim that the Company's Board of Directors or any individual  member
         of the  Company's  Board of  Directors  did not comply  with its or his
         fiduciary duties under Delaware law.

                  (c) In reliance  upon the  representations  in paragraph  (b),
         Parent agrees to indemnify, defend and hold harmless each member of the
         Company's Board of Directors that has executed and delivered,  or whose
         affiliate  or employer  has  executed  and  delivered,  a Stock  Option
         Agreement  (each an  "Indemnified  Party")  against  any  loss,  claim,
         damage,  liability  or  expense,  to which such  Indemnified  Party may
         become subject, insofar, but only insofar, as such loss, claim, damage,
         liability or expense  arises  solely out of, or is based solely upon, a
         claim that an  Indemnified  Party's  fiduciary  duty as a member of the
         Company's  Board of  Directors  under  Delaware law was breached by the
         execution and delivery by him, or his affiliate or employer,  in his or
         its  capacity  as a  stockholder  of the  Company,  of a  Stock  Option
         Agreement (a "Claim").  Should a court of competent  jurisdiction award
         damages  against any Indemnified  Party without  specifying the portion
         thereof  allocable  solely to the matters  referred to in the preceding
         sentence,  the Parent and the Company shall petition such court to make
         such  allocation.  If the court  refuses  to do so,  the Parent and the
         Company shall negotiate

<PAGE>38


                  in good faith to reach an agreement with respect to such
         allocation.

                  (d)  Notwithstanding  the  provisions  of paragraph (c) above,
         Parent shall have no obligation to indemnify,  defend and hold harmless
         any  Indemnified  Party  pursuant  to  paragraph  (c)  unless:  (i) the
         representations  contained  in  paragraph  (b)  above are true and (ii)
         neither  the  Indemnified  Party nor any  affiliate  or employer of the
         Indemnified  Party is a party to a Claim;  provided that if the Company
         is the beneficiary of any Claim, the amount that such Indemnified Party
         is entitled to receive pursuant to paragraph (c) shall be reduced by an
         amount  equal to the pro rata amount of such Claim paid to the Company,
         indirectly  attributable  to the  Indemnified  Party by  reason  of its
         stockholdings  in the Company.  In  addition,  Parent's  obligation  to
         indemnify,  defend and hold  harmless  any  Indemnified  Party shall be
         reduced  by and to the  extent  that  (i)  such  Indemnified  Party  is
         indemnified pursuant to the Company's By-laws and (ii) such Indemnified
         Party is indemnified from, or receive proceeds of, any insurance policy
         applicable to a Claim.  Each  Indemnified  Party shall make any and all
         claims  pursuant  to the  Company's  By-laws  with  respect  to seeking
         indemnification  for a Claim and shall  file any and all  claims  under
         such  insurance  policy with respect to a Claim and use its  reasonable
         efforts to file any and all claims  under such  By-law  provisions  and
         insurance  policy  on a  timely  basis.  If  Parent  shall  release  an
         Indemnified Party from its obligations under the Stock Option Agreement
         prior to the use of the Proxy granted therein at the Company Meeting or
         the exercise of the option  contemplated by the Stock Option Agreement,
         Parent shall have no obligation to indemnify,  defend and hold harmless
         such  Indemnified  Party for loss claim,  damage,  liability or expense
         incurred after such release.

                  (e) If any  Claim  shall be  brought  against  an  Indemnified
         Party,  Parent  shall  assume the defense  thereof  with counsel of its
         selection, and shall have absolute discretion to settle any Claims, and
         each  Indemnified  Party shall cooperate with the defense or settlement
         thereof.  After  Parent has assumed  the defense of such claim,  Parent
         shall not be liable to the Indemnified Party under this Section 8.5 for
         any legal or other expenses  subsequently  incurred by the  Indemnified
         Party in connection with the defense thereof.

                  Section  8.6.  HSR Act. The Company and Parent shall use their
best efforts to file as soon as practicable  notifications  under the HSR Act in
connection  with the Merger and the  transactions  contemplated  hereby,  and to
respond as promptly as  practicable  to any inquiries  received from the Federal
Trade Commission and the

<PAGE>39


                  Antitrust Division of the Department of Justice for additional
information  or  documentation  and to respond as promptly as practicable to all
inquiries  and  requests  received  from any  State  Attorney  General  or other
governmental authority in connection with antitrust matters.

                  Section 8.7.  Additional Agreements.

                  (a) Subject to the terms and conditions herein provided,  each
         of the parties hereto agrees to use all reasonable  efforts to take, or
         cause to be taken,  all  actions  and to do,  or cause to be done,  all
         things  necessary,  proper  or  advisable  under  applicable  laws  and
         regulations  to  consummate   and  make   effective  the   transactions
         contemplated by this Merger  Agreement,  including using all reasonable
         efforts to obtain all necessary  waivers,  consents and  approvals,  to
         effect all  necessary  registrations  and filings  (including,  but not
         limited  to,  filings  under  the  HSR  Act  and  with  all  applicable
         Governmental Entities) and to lift any injunction or other legal bar to
         the  Merger  (and,  in  such  case,  to  proceed  with  the  Merger  as
         expeditiously as possible), subject, however, in the case of the Merger
         Agreement and the Parent Share Proposal, to the appropriate vote of the
         stockholders of the Company and Parent.  Notwithstanding the foregoing,
         there  shall be no action  required  to be taken and no action  will be
         taken in order  to  consummate  and  make  effective  the  transactions
         contemplated by this Merger  Agreement if such action,  either alone or
         together  with  another  action,  would  result in a  Company  Material
         Adverse Effect or a Parent Material Adverse Effect.

                  (b) In case at any time after the  Effective  Date any further
         action is  necessary  or  desirable  to carry out the  purposes of this
         Merger Agreement,  the proper officers and/or directors of Parent,  the
         Company and the  Surviving  Corporation  shall take all such  necessary
         action.

                  (c) Following the  Effective  Date,  Parent shall use its best
         efforts  to  conduct  the  business,  and  shall  cause  the  Surviving
         Corporation to use its best efforts to conduct its business,  except as
         otherwise  contemplated  by this Merger  Agreement,  in a manner  which
         would  not  jeopardize  the   characterization   of  the  Merger  as  a
         reorganization within the meaning of Section 368(a) of the Code.

                  Section 8.8.  No Solicitation.  Neither the Company nor any
of its subsidiaries shall, directly or indirectly, take (nor shall the Company
authorize or permit its subsidiaries, officers, directors, employees,
representatives, investment bankers, attorneys, accountants or other agents or
affiliates, to take)

<PAGE>40


                  any  action  to  (i)   encourage,   solicit  or  initiate  the
submission  of any  Acquisition  Proposal,  (ii) enter into any  agreement  with
respect  to  any  Acquisition  Proposal  or  (iii)  participate  in  any  way in
discussions or  negotiations  with, or furnish any information to, any person in
connection  with,  or take any other action to  facilitate  any inquiries or the
making of any proposal that  constitutes,  or may reasonably be expected to lead
to, any Acquisition Proposal;  provided, however, that nothing contained in this
Merger  Agreement  shall prevent the Company or its Board of Directors  from (A)
furnishing  non-public  information  to, or entering into  discussions  with any
person or entity in connection with an unsolicited bona fide written Acquisition
Proposal by such person or entity  (including a new and unsolicited  Acquisition
Proposal  received by the Company after the  execution of this Merger  Agreement
from a person or entity  whose  initial  contact  with the Company may have been
solicited by the Company  prior to the  execution of this Merger  Agreement)  if
prior to furnishing such non-public information to, or entering into discussions
or negotiations  with, such person or entity,  such Board of Directors  receives
from such  person  or  entity an  executed  confidentiality  agreement  or,  (B)
withdrawing  the  Company's  Board of  Directors'  recommendation  of the Merger
Agreement,  if and only to the  extent  that the  Company's  Board of  Directors
believes in good faith (after consultation with and based upon the advice of its
financial advisor) that such Acquisition Proposal would, if consummated,  result
in a transaction  more favorable to the Company's  stockholders  than the Merger
and the  Board of  Directors  of the  Company  determines  in good  faith  after
consultation  with and based upon a written opinion of its outside legal counsel
that such  withdrawal  is  necessary  for the  directors  to comply  with  their
fiduciary duties to the stockholders under applicable Delaware law and that such
withdrawal  will  not  affect  the  validity  of the  submission  of the  Merger
Agreement  to the  stockholders  of the Company  pursuant to Delaware law or the
enforceability  of the  Stock  Option  Agreement;  or (B)  complying  with  Rule
14e-2(a)(2)  or (3)  promulgated  under  the  Exchange  Act  with  regard  to an
Acquisition  Proposal.  The  Company  will  promptly  communicate  to Parent any
solicitation by the Company and the terms of any proposal or inquiry,  including
the  identity  of the person  and its  affiliates  making the same,  that it may
receive in respect of any such transaction, or of any such information requested
from it or of any such  negotiations or discussions being sought to be initiated
with  it.   "Acquisition   Proposal"   shall  mean  any   proposed  (A)  merger,
consolidation or similar transaction  involving the Company,  (B) sale, lease or
other  disposition  directly  or  indirectly  by  merger,  consolidation,  share
exchange or otherwise of assets of the Company or its subsidiaries  representing
10% or more of the consolidated assets of the Company and its subsidiaries,  (C)
issue, sale, or other disposition of (including by way of merger, consolidation,
share exchange or any similar  transaction)  securities  (or options,  rights or
warrants to purchase, or securities convertible into or exchangeable for,

<PAGE>41


                  such securities)  representing 10% or more of the voting power
of the Company or (D)  transaction in which any person shall acquire  beneficial
ownership (as such term is defined in Rule 13d-3 under the Exchange Act), or the
right to acquire  beneficial  ownership  or any "group" (as such term is defined
under the Exchange  Act) shall have been formed which  beneficially  owns or has
the right to  acquire  beneficial  ownership  of 25% or more of the  outstanding
Company Common Stock.

                  Section 8.9.  Limitation on Acquisition  Activities.  From the
date of the  Merger  Agreement  until  the  Effective  Date,  Parent  shall  not
participate in any way in discussions  or  negotiations  with, or enter into any
agreement  pursuant to which Parent would acquire or agree to acquire by merging
or consolidating  with, or by purchasing a substantial equity interest in, or by
any other manner, any business or any corporation,  partnership,  association or
other business  organization or division  thereof,  in which case either (i) the
acquired  business or entity is in the  business of providing  Internet  access,
(ii)  the  acquisition  would  involve  aggregate  consideration  in  excess  of
$500,000,000, or (iii) the acquisition could reasonably be expected to delay the
satisfaction of the conditions set forth in Article IX hereof.

                  Section 8.10.  Notice of Actions.  From the date of the Merger
Agreement  until the Effective  Date, each party shall promptly notify the other
party in writing of any pending or, to the best  knowledge  of the first  party,
threatened action, proceeding or investigation by any Governmental Entity or any
other person (i) challenging or seeking  material damages in connection with the
Merger or the  conversion  of the Company  Common Stock into Parent Common Stock
pursuant to the Merger or (ii) seeking to restrain or prohibit the  consummation
of the Merger or otherwise  limit the right of Parent or, to the best  knowledge
of such party, Parent's subsidiaries to own or operate all or any portion of the
businesses or assets of the Company,  which in either case is reasonably  likely
to have a Company  Material Adverse Effect prior to or after the Effective Date,
or a Parent Material Adverse Effect after the Effective Date.

                  Section 8.11. Benefit Plans Generally.  Parent agrees to honor
in accordance with their terms all employment,  severance and similar agreements
to which the Company or any subsidiary is a party and all accrued  benefits that
are vested as of the  Effective  Date under any  Company  Benefit  Plan or Stock
Option Plan,  except as provided by the terms thereof.  Parent agrees to provide
employees of the Company and its  subsidiaries  with credit for all service with
the Company or its affiliates for purposes of vesting and eligibility  under any
employee  benefit  plan,  program or  arrangement  of Parent or its  affiliates,
including all

<PAGE>42


                  employee equity  incentive  programs of Parent.  To the extent
not otherwise  specified in this Merger Agreement,  Parent agrees that employees
of the Company and its  subsidiaries  who continue to be employed by the Company
or its  subsidiaries  after the Effective  Date may continue to  participate  in
their current Company sponsored  employee benefit programs through twelve months
following the Effective  Date.  After the Effective  Date,  the employees of the
Company and its subsidiaries shall be eligible to participate in the appropriate
employee  equity  incentive  programs of Parent,  as determined by Parent in its
sole discretion.

                  Section 8.12. Stockholders' Rights Plan. From the date of this
Merger  Agreement  until the  expiration  or  termination  of the  Stock  Option
Agreement,  the Company  shall not amend its  certificate  of  incorporation  or
otherwise  take action to provide for the issuance of  securities  pursuant to a
stockholder rights plan or any similar program or plan.

                                   ARTICLE IX.

                              CONDITIONS PRECEDENT

                  Section 9.1.  Conditions to Each Party's  Obligation to Effect
the Merger. The respective  obligations of each party to effect the Merger shall
be subject to the fulfillment at or prior to the Effective Date of the following
conditions:

                  (a) This Merger  Agreement and the  transactions  contemplated
         hereby shall have been  approved and adopted by the  requisite  vote of
         the holders of the Company Common Stock.

                  (b) The Parent Share  Proposal shall have been approved by the
         requisite vote of the holders of the Parent capital stock.

                  (c) The Parent Common Stock  issuable in the Merger shall have
         been  authorized  for  inclusion  in  Nasdaq  upon  official  notice of
         issuance.

                  (d) The waiting period  applicable to the  consummation of the
         Merger under the HSR Act shall have expired or been terminated.

                  (e) The Registration  Statement shall have become effective in
         accordance  with the  provisions of the  Securities  Act. No stop order
         suspending the  effectiveness of the Registration  Statement shall have
         been issued by the  Commission  and remain in effect and all  necessary
         approvals

<PAGE>43


                  under  state  securities  laws  relating  to the  issuance  or
         trading  of the  Parent  Common  Stock  to be  issued  to  the  Company
         stockholders in connection with the Merger shall have been received.

                  (f) No preliminary  or permanent  injunction or other order by
         any  Federal or state court in the United  States  which  prevents  the
         consummation  of the Merger shall have been issued and remain in effect
         (each  party  agreeing  to use  its  best  efforts  to  have  any  such
         injunction lifted).

                  Section 9.2. Conditions to Obligation of the Company to Effect
the Merger.  The obligation of the Company to effect the Merger shall be subject
to the fulfillment at or prior to the Effective Date of the additional following
conditions, unless waived by the Company:

                  (a)  Parent  and Sub  shall  have  performed  in all  material
         respects their agreements  contained in this Merger Agreement  required
         to  be   performed  on  or  prior  to  the   Effective   Date  and  the
         representations  and  warranties  of Parent and Sub  contained  in this
         Merger  Agreement shall be true in all material  respects when made and
         on and as of the  Effective  Date as if  made  on and as of  such  date
         (except  to the  extent  they  relate to a  particular  date),  and the
         Company  shall have  received a  certificate  of the President or Chief
         Executive Officer or a Vice President of Parent and Sub to that effect.

                  (b) The  Company  shall have  received  an  opinion  dated the
         Effective  Date from Heller  Ehrman White &  McAuliffe,  counsel to the
         Company,  that,  based  upon  certain  factual  representations  of the
         Company,  Parent and Sub  reasonably  requested  by such  counsel,  the
         Merger  will be  treated  as a  reorganization  within  the  meaning of
         Section 368(a).

                  (c)  All   permits,   consents,   authorizations,   approvals,
         registrations,  qualifications, designations and declarations set forth
         in  Section  4.4  of the  Parent  Disclosure  Letter  shall  have  been
         obtained,  and all  filings and notices set forth in Section 4.4 of the
         Parent Disclosure Letter shall have been submitted by Parent.

                  (d) Parent shall have taken all action  necessary to cause Mr.
         John W. Sidgmore and up to two additional individuals designated by the
         Company and  acceptable  to Parent,  to become  members of the Board of
         Directors of Parent subject to the consummation of the Merger.
<PAGE>44
                  Section 9.3.  Conditions to  Obligations  of Parent and Sub to
Effect the Merger.  The obligations of Parent and Sub to effect the Merger shall
be  subject  to the  fulfillment  at or  prior  to  the  Effective  Date  of the
additional following conditions, unless waived by Parent:

                  (a) The Company shall have performed in all material  respects
         its  agreements  contained  in this  Merger  Agreement  required  to be
         performed on or prior to the Effective Date and the representations and
         warranties of the Company  contained in this Merger  Agreement shall be
         true in all material  respects when made and on and as of the Effective
         Date as if  made on and as of such  date  (except  to the  extent  they
         relate to a particular  date),  except as  contemplated or permitted by
         this  Merger  Agreement,  and  Parent  and Sub shall  have  received  a
         certificate  of the  President  or Chief  Executive  Officer  or a Vice
         President of the Company to that effect.

                  (b) Parent shall have received an opinion of counsel to Parent
         that, the Merger will be treated as a reorganization within the meaning
         of Section  368(a) of the Code,  and that the  Company,  Parent and Sub
         will  each be a party to that  reorganization  within  the  meaning  of
         Section 368(b) of the Code.

                  (c)  All   permits,   consents,   authorizations,   approvals,
         registrations,  qualifications, designations and declarations set forth
         in  Section  5.4 of the  Company  Disclosure  Letter  shall  have  been
         obtained  and to the  extent  required  to be  submitted  prior  to the
         Effective Date, all filings and notices set forth in Section 5.4 of the
         Company Disclosure Letter shall have been submitted by the Company.

                  (d)  Parent shall have received the Affiliate Letters.

                                   ARTICLE X.

                        TERMINATION, AMENDMENT AND WAIVER

                  Section 10.1.  Termination.  This Merger Agreement may be
terminated at any time prior to the Effective Date, whether before or after
approval by the stockholders of the Company:

                  (a)  by mutual consent of the Board of Directors of Parent
         and the Board of Directors of the Company;

                  (b) by either  Parent or the  Company if the Merger  shall not
         have been  consummated  on or before  November 30, 1996  (provided  the
         terminating   party  is  not  otherwise  in  material   breach  of  its
         representations,   warranties   or   obligations   under  this   Merger
         Agreement);



<PAGE>45


                  (c) by the  Company  if any  of the  conditions  specified  in
         Sections 9.1 and 9.2 have not been met or waived by the Company at such
         time as such condition is no longer capable of satisfaction;

                  (d) by Parent if any of the  conditions  specified in Sections
         9.1 and 9.3 have not been met or  waived by Parent at such time as such
         condition is no longer capable of satisfaction;

                  (e)  by Parent if any of the following shall have occurred
         (each, a "Purchase Event"):


                           (i) any person  (other than Parent or any  subsidiary
                  of Parent)  shall have  commenced  (as such term is defined in
                  Rule 14d-2 under the Exchange Act), a tender offer or exchange
                  offer to  purchase  any  shares of Company  Common  Stock such
                  that, upon  consummation of such offer,  such person would own
                  or control 50% or more of the then outstanding  Company Common
                  Stock,  and the Board of Directors of the Company,  within ten
                  business  days after such tender or exchange  offer shall have
                  been so commenced,  fails to recommend  against  acceptance of
                  such tender or exchange offer by its stockholders,  and Parent
                  shall deliver a written  notice of  termination to the Company
                  within 20 business  days after the  expiration  of such 10 day
                  period;


                           (ii) the  Company or any  subsidiary  of the  Company
                  shall  have  authorized,  recommended,  proposed  or  publicly
                  announced an intention to authorize,  recommend or propose, or
                  entered into, an agreement  with any person (other than Parent
                  or  any   subsidiary  of  Parent)  to  (A)  effect  a  merger,
                  consolidation or similar transaction  involving the Company or
                  any of its material subsidiaries, (B) sell, lease or otherwise
                  dispose  of  assets  of  the   Company  or  its   subsidiaries
                  representing  10% or more of the  consolidated  assets  of the
                  Company  and its  subsidiaries  (other  than  in the  ordinary
                  course of business) or (C) issue, sell or otherwise dispose of
                  (including by way of merger, consolidation,  share exchange or
                  any similar  transaction)  securities  (or options,  rights or
                  warrants to purchase,  or securities  convertible  into,  such
                  securities)  representing  10% or more of the voting  power of
                  the Company or any of its subsidiaries;


                           (iii) any person (other than Parent,  any  subsidiary
                  of  Parent  or the  Company  or any of its  subsidiaries  in a
                  fiduciary capacity) shall have acquired  beneficial  ownership
                  (as such term is defined in Rule 13d-3 under the Exchange Act)
                  or the right to

<PAGE>46



                           acquire  beneficial  ownership of, or any "group" (as
                  such term is defined  under the Exchange  Act) shall have been
                  formed  which  beneficially  owns or has the right to  acquire
                  beneficial  ownership of, 25% or more of the then  outstanding
                  Company Common Stock; or

                  (f) by either  Parent or the  Company if the  approval  of the
         Company's  stockholders  required by Section 9.1(a) shall not have been
         obtained at the Company Meeting; or

                  (g) by  either  Parent  or the  Company  if  the  approval  of
         Parent's  stockholders  required by Section  9.1(b) shall not have been
         obtained at the Parent Meeting.

                  Section  10.2.   Effect  of  Termination.   In  the  event  of
termination  of this  Merger  Agreement  by  either  Parent or the  Company,  as
provided above,  this Merger  Agreement shall forthwith  become void and (except
for the willful breach of this Merger Agreement by any party hereto) there shall
be no  liability  on the part of  either  the  Company,  Parent  or Sub or their
respective  officers,  directors,  employees or agents;  provided  that the last
sentence of Section 8.1 and Sections 8.5, 8.6, 8.12,  10.2 and Article XI (other
than Section 11.4) shall survive the termination.

                  Section 10.3. Amendment.  This Merger Agreement may be amended
by the parties hereto, by or pursuant to action taken by their respective Boards
of Directors, at any time before or after approval hereof by the stockholders of
the Company and Parent,  but,  after such approval,  no amendment  shall be made
which changes the ratios at which Company  Common Stock is to be converted  into
Parent  Common  Stock as provided in Section 3.1 or which in any way  materially
adversely affects the rights of such stockholders,  without the further approval
of such  stockholders.  This Merger  Agreement  may not be amended  except by an
instrument in writing signed on behalf of each of the parties hereto.

                  Section  10.4.  Extension;  Waivers.  At any time prior to the
Effective  Date,  the parties  hereto,  by or pursuant to action  taken by their
respective  Boards of Directors,  may (i) extend the time for the performance of
any of the obligations or other acts of the other parties hereto, (ii) waive any
inaccuracies in the  representations  and warranties  contained herein or in any
documents  delivered  pursuant hereto and (iii) waive compliance with any of the
agreements or conditions  contained herein. Any agreement on the part of a party
hereto  to any such  extension  or  waiver  shall  be  valid if set  forth in an
instrument in writing signed on behalf of such party.



<PAGE>47


                                   ARTICLE XI.

                               GENERAL PROVISIONS

                  Section 11.1. Non-Survival of Representations,  Warranties and
Agreements. All representations and warranties set forth in the Merger Agreement
shall terminate at the Effective Date. All covenants and agreements set forth in
the Merger Agreement shall survive in accordance with their terms.

                  Section  11.2.  Notices.  All notices or other  communications
under this Merger  Agreement  shall be in writing and shall be given by delivery
in person,  by  facsimile,  cable,  telegram,  telex or other  standard  form of
telecommunications,  or by registered or certified mail, postage prepaid, return
receipt  requested,  addressed as follows (or such other  address for a party as
shall be specified in a notice given in  accordance  with this Section 11.2) and
shall be deemed  to have  been  given one  business  day after  transmission  by
facsimile,  cable, telegram,  telex or other standard form of telecommunications
or four days after deposit in the U.S. mail:


                           If to the Company:

                           UUNET Technologies, Inc.
                           3060 William Drive
                           Fairfax, Virginia 22031
                           Attention:  John W. Sidgmore
                              Martina W. Knee, Esq.
                           Facsimile No.: (703) 206-5807

                           with a copy to:

                           Heller Ehrman White & McAuliffe
                           525 University Avenue
                           Palo Alto, California 94301
                           Attention:  August J. Moretti, Esq.
                                                and Richard Friedman, Esq.
                           Facsimile No.:  (415) 324-0638

                           If to Parent or Sub:

                           Prior to May 18, 1996:

                           MFS Communications Company, Inc.
                           3555 Farnam Street, 2nd Floor
                           Omaha, Nebraska  68131
                           Attention:  General Counsel
                           Facsimile No.:  (402) 977-5335



<PAGE>48


                           On or after May 18, 1996:

                           MFS Communications Company, Inc.
                           11808 Miracle Hills Drive
                           Omaha, Nebraska  68154
                           Attention:  General Counsel
                           Facsimile No.:  (402) 231-3545

                           With a copy to:

                           Willkie Farr & Gallagher
                           One Citicorp Center
                           153 East 53rd Street
                           New York, New York  10022
                           Attention:  John S. D'Alimonte, Esq.
                           Facsimile No.:  (212) 821-8111

or to such other address as any party may have furnished to the other parties in
writing in accordance with this Section.

                  Section 11.3.  Fees and Expenses.

                  (a)  Whether or not the Merger is  consummated,  all costs and
         expenses  incurred in  connection  with this Merger  Agreement  and the
         transactions contemplated by this Merger Agreement shall be paid by the
         party incurring such expenses.

                  (b) If (i) Parent has terminated  this  Agreement  pursuant to
         the  provisions of (A) Section  10.1(f) or (B) Section  10.1(d) as such
         Section  relates to Section 9.3(a) and (ii) within  18-months after the
         date of such termination, the Company shall either accept, or recommend
         to its stockholders for approval,  an Acquisition  Proposal that Parent
         in good faith believes would,  if consummated,  result in a transaction
         more favorable to the stockholders of the Company than the Merger,  the
         Company shall pay to Parent a fee of $60,000,000, which amount shall be
         payable by wire  transfer of  immediately  available  funds  within two
         business days after the acquisition  contemplated  by such  Acquisition
         Proposal is consummated. The obligation of the Company pursuant to this
         paragraph  (b) shall not be  prejudiced  by an exercise of  termination
         rights by the Company  within five  business days prior to the exercise
         by Parent of its termination rights under this Merger Agreement.

                  (c) If (i) the Company has terminated this Agreement  pursuant
         to the provisions of (A) Section 10.1(g) or (B) Section 10.1(c) as such
         Section relates to Section 9.2(a), Parent shall:



<PAGE>49


                           (i) pay to the  Company a fee of  $60,000,000,  which
                  amount  shall  be  payable  by wire  transfer  of  immediately
                  available   funds   within  two   business   days  after  such
                  termination;

                           (ii) at the option of the Company,  purchase from the
                  Company  1,551,724 shares of Company Common Stock (as adjusted
                  for stock  splits,  reverse  stock  splits,  stock  dividends,
                  recapitalizations  and other similar  events) for an aggregate
                  purchase price of $90,000,000, which purchase shall take place
                  on the fifth  business day  following the later of (A) written
                  notice  by the  Company  to  the  Parent  that a  registration
                  statement  under the  Securities  Act  pursuant  to which such
                  shares will be sold to the Parent has been declared  effective
                  and (B)  written  notice by the Company to the Parent that the
                  waiting  period  applicable to such purchase under the HSR Act
                  has expired or has been terminated; and

                           (iii) at the option of the Company,  commencing  on a
                  date to be mutually agreed upon by the Company and Parent, but
                  in no event  later  than 180 days  after  notification  by the
                  Company,  provide  data  communications  services,   including
                  private line and local special access  circuits to the Company
                  at Parent's cost for a period of five years, with an aggregate
                  total value of such circuits not to exceed $100,000,000,  with
                  no more than $25,000,000 in any calendar year, and the cost of
                  such services to be jointly  determined by the parties or by a
                  mutually  acceptable  third-party.  Parent  will  provide  the
                  Company with timely  network  planning  information  regarding
                  Parent's network expansions and service availability.

         The  obligation of Parent  pursuant to this  paragraph (c) shall not be
         prejudiced by an exercise of  termination  rights by Parent within five
         business  days prior to the exercise by the Company of its  termination
         rights under this Merger Agreement.

                  Section 11.4.  Publicity.  So long as this Merger Agreement is
in effect,  Parent,  Sub and the  Company  agree to  consult  with each other in
issuing any press release or otherwise  making any public statement with respect
to the  transactions  contemplated  by this Merger  Agreement,  and none of them
shall  issue any press  release or make any  public  statement  relating  to the
transactions  contemplated  hereby prior to such consultation,  except as may be
required by law or by obligations pursuant to any listing agreement with Nasdaq.
The  commencement  of  litigation  relating  to  the  Merger  Agreement  or  the
transactions contemplated hereby


<PAGE>50


                  or any proceedings in connection therewith shall not be
deemed a violation of this Section 11.4.

                  Section 11.5. Specific  Performance.  The parties hereto agree
that  irreparable  damage would occur in the event that any of the provisions of
this Merger Agreement were not performed in accordance with their specific terms
or were otherwise  breached.  It is accordingly agreed that the parties shall be
entitled to an  injunction  or  injunctions  to prevent  breaches of this Merger
Agreement and to enforce  specifically  the terms and  provisions  hereof in any
court of the  United  States or any state  having  jurisdiction,  this  being in
addition to any other remedy to which they are entitled at law or in equity.

                  Section 11.6. Assignment;  Binding Effect. Neither this Merger
Agreement nor any of the rights,  interests or  obligations  hereunder  shall be
assigned by any of the parties hereto (whether by operation of law or otherwise)
without the prior written  consent of the other  parties,  except that Sub shall
have the right to assign to Parent or any  direct  wholly  owned  subsidiary  of
Parent any and all rights and  obligations  of Sub under this Merger  Agreement.
Subject to the preceding  sentence,  this Merger Agreement shall be binding upon
and shall  inure to the  benefit  of the  parties  hereto  and their  respective
successors and assigns. Nothing in this Merger Agreement,  expressed or implied,
except as specifically  set forth in Sections 8.5 or 10.2, is intended to confer
on any person other than the parties hereto or their  respective  successors and
assigns any rights,  remedies,  obligations or liabilities under or by reason of
this Merger Agreement.

                  Section 11.7.  Entire Agreement.  This Merger  Agreement,  the
Exhibits,  the Company  Disclosure  Letter,  the Parent Disclosure  Letter,  the
Confidentiality  Agreement  dated March 5, 1996,  between the Company and Parent
and any documents delivered by the parties in connection herewith constitute the
entire agreement among the parties with respect to the subject matter hereof and
supersede all prior agreements and understandings among the parties with respect
thereto.  No  addition  to or  modification  of any  provision  of  this  Merger
Agreement  shall be binding  upon any party  hereto  unless  made in writing and
signed by all parties hereto.

                  Section 11.8.  Governing Law.  This Merger Agreement shall be
governed by and construed in accordance with the laws of the State of Delaware,
without regard to its rules of conflict of laws.

                  Section  11.9.  Counterparts.  This  Merger  Agreement  may be
executed by the parties hereto in separate  counterparts,  each of which when so
executed and delivered  shall be an original,  but all such  counterparts  shall
together constitute one and the same instrument. Each counterpart may consist of
a number of copies  hereof each signed by less than all, but together  signed by
all of the parties hereto.
<PAGE>51
                  Section 11.10. Headings,  Table of Contents,  Index of Defined
Terms. Headings of the Articles and Sections of this Merger Agreement, the Table
of  Contents  and the  Index of  Defined  Terms are for the  convenience  of the
parties  only,  and  shall  be  given  no  substantive  or  interpretive  effect
whatsoever.

                  Section  11.11.  Interpretation.  In  this  Merger  Agreement,
unless the context  otherwise  requires,  words  describing the singular  number
shall  include the plural and vice versa,  and words  denoting  any gender shall
include  all  genders  and  words   denoting   natural   persons  shall  include
corporations and partnerships and vice versa.

                  Section  11.12.  Waivers.  Except as  provided  in this Merger
Agreement, no action taken pursuant to this Merger Agreement, including, without
limitation,  any investigation by or on behalf of any party,  shall be deemed to
constitute  a waiver by the party  taking  such  action of  compliance  with any
representations,  warranties,  covenants or agreements  contained in this Merger
Agreement. The waiver by any party hereto of a breach of any provision hereunder
shall not operate or be construed as a waiver of any prior or subsequent  breach
of the same or any other provision hereunder.

                  Section  11.13.  Severability.  Any term or  provision of this
Merger Agreement which is invalid or unenforceable in any jurisdiction shall, as
to that  jurisdiction,  be  ineffective  to the  extent  of such  invalidity  or
unenforceability  without rendering invalid or unenforceable the remaining terms
and   provisions  of  this  Merger   Agreement  or  affecting  the  validity  or
enforceability of any of the terms or provisions of this Merger Agreement in any
other jurisdiction.  If any provision of this Merger Agreement is so broad as to
be  unenforceable,  the provision shall be interpreted to be only so broad as is
enforceable.

                  Section 11.14. Subsidiaries. As used in this Merger Agreement,
the word  "subsidiary" when used with respect to any party means any corporation
or other  organization,  whether  incorporated or unincorporated,  of which such
party  directly  or  indirectly  owns or  controls  at least a  majority  of the
securities or other  interests  having by their terms  ordinary  voting power to
elect a  majority  of the  board  of  directors  or  others  performing  similar
functions  with  respect  to such  corporation  or  other  organization,  or any
organization of which such party is a general partner.

                            [Signature pages follow.]





<PAGE>52


                  IN WITNESS  WHEREOF,  Parent,  Sub and the Company have caused
this Merger  Agreement to be executed by their  respective  officers  thereunder
duly authorized all as of the date first written above.

                                             MFS COMMUNICATIONS COMPANY, INC.



                                                    /s/ James Q. Crowe
                                             Name:  James Q. Crowe
                                             Title:  Chairman and CEO


                                             MFS GLOBAL INTERNET SERVICES, INC.



                                                    /s/ James Q. Crowe
                                             Name:  James Q. Crowe
                                             Title:  President


                                             UUNET TECHNOLOGIES, INC.



                                                    /s/ John W. Sidgmore
                                             Name:  John W. Sidgmore
                                             Title:  President and CEO












<PAGE>1




                                                                       EXHIBIT 3

                             JOINT FILING AGREEMENT

                  The  undersigned  hereby agree that the  statement on Schedule
13D dated May 9, 1996,  with respect to the Common Stock of UUNET  Technologies,
Inc. is, and any amendments  thereto signed by each of the undersigned shall be,
filed on behalf of each of us pursuant to and in accordance  with the provisions
of Rule 13d-1(f) under the Securities Exchange Act of 1934.

                  This Agreement may be executed in counterparts,  each of which
shall  for all  purposes  be  deemed to be an  original  and all of which  shall
constitute one and the same instrument.



Dated:  May 9, 1996

                                        MFS Communications Company, Inc.

                                        By:        /s/ James Q. Crowe
                                                 James Q. Crowe
                                                 Chairman of the Board and
                                                 Chief Executive Officer


                                        MFS Global Internet Services, Inc.

                                        By:        /s/ Albert L. Fenn, Jr.
                                                 Albert L. Fenn, Jr.
                                                 President




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